Space Race
The Space Race was an informal 20th-century competition between two Cold War rivals, the Soviet Union (USSR) and the United States (US), to achieve firsts in spaceflight capability. It had its origins in the ballistic missile-based nuclear arms race between the two nations following World War II. The technological advantage required to rapidly achieve spaceflight milestones was seen as necessary for national security, and mixed with the symbolism and ideology of the time. The Space Race led to pioneering efforts to launch artificial satellites, uncrewed space probes of the Moon, Venus, and Mars, and human spaceflight in low Earth orbit and to the Moon.history.com, Space Race

The competition began in earnest on August 2, 1955, when the Soviet Union responded to the US announcement four days earlier of intent to launch artificial satellites for the International Geophysical Year, by declaring they would also launch a satellite "in the near future". The Soviet Union achieved the first successful launch with the October 4, 1957, orbiting of Sputnik 1, and sent the first human to space with the orbital flight of Yuri Gagarin on April 12, 1961. The USSR also sent the first woman, Valentina Tereshkova, to space on June 16, 1963, with numerous other firsts taking place over the next few years with regards to flight duration, spacewalks and related activities. According to Russian sources, these achievements led to the conclusion that the USSR had an advantage in space technology in the early 1960s.history.com, From Sputnik to Spacewalking: 7 Soviet Space Firsts, Oct 4, 2012

According to US sources, the "race" peaked with the July 20, 1969, US landing of the first humans on the Moon with Apollo 11. Most US sources will point to the Apollo 11 lunar landing as a singular achievement far outweighing any combination of Soviet achievements. The USSR attempted several crewed lunar missions, but eventually canceled them and concentrated on Earth orbital space stations, while the US landed several more times on the Moon.

A period of détente followed with the April 1972 agreement on a co-operative Apollo–Soyuz, resulting in the July 1975 rendezvous in Earth orbit of a US astronaut crew with a Soviet cosmonaut crew and co-developing the enabling docking standard APAS-75. Though cooperation had been pursued since the very beginning of the Space Age, Apollo–Soyuz eased the competition to enable later cooperation. The end of the Space Race and competition is not clear cut, since the Apollo 11 Moon landing and the ASTP have been identified as such, but with the December 1991 dissolution of the Soviet Union it was ultimately replaced through increased spaceflight cooperation with the APAS enabled Shuttle–Mir and International Space Station programs between the US and the newly founded Russian Federation.

The Space Race has left a technology legacy of increased space related development and advances. It sparked increases in spending on education and research and development, which led to many spin-off effectsNASA Spinoff 2019 Retrieved August 1, 2019 such as the NASA Technology Transfer Program.

Early rocket development

Germany during World War II
thumb|upright|Wernher von Braun (1912–1977), technical director of Nazi Germany's missile program, became the United States' lead rocket engineer during the 1950s and 1960s
The origins of the Space Race can be traced to Germany, beginning in the 1930s and continuing during World War II when Nazi Germany researched and built operational ballistic missiles capable of sub-orbital spaceflight. Starting in the early 1930s, during the last stages of the Weimar Republic, German aerospace engineers experimented with liquid-fueled rockets, with the goal that one day they would be capable of reaching high altitudes and traversing long distances.Cornwell (2003), p. 147 The head of the German Army's Ballistics and Munitions Branch, Lieutenant Colonel Karl Emil Becker, gathered a small team of engineers that included Walter Dornberger and Leo Zanssen, to figure out how to use rockets as long-range artillery in order to get around the Treaty of Versailles' ban on research and development of long-range cannons.Cornwell (2004), p. 146 Wernher von Braun, a young engineering prodigy, was recruited by Becker and Dornberger to join their secret army program at Kummersdorf-West in 1932.Cornwell (2003), p. 148 Von Braun dreamed of conquering outer space with rockets and did not initially see the military value in missile technology.Cornwell (2003), p. 150

During the Second World War, General Dornberger was the military head of the army's rocket program, Zanssen became the commandant of the Peenemünde army rocket center, and von Braun was the technical director of the ballistic missile program.Burrows (1998), p. 96 They led the team that built the Aggregat-4 (A-4) rocket, which became the first vehicle to reach outer space during its test flight program in 1942 and 1943.Burrows (1998), pp. 99–100 By 1943, Germany began mass-producing the A-4 as the Vergeltungswaffe 2 ("Vengeance Weapon" 2, or more commonly, V2), a ballistic missile with a  range carrying a  warhead at .Burrows (1998), pp. 98–99 Its supersonic speed meant there was no defense against it, and radar detection provided little warning.Stocker (2004), pp. 12–24 Germany used the weapon to bombard southern England and parts of Allied-liberated western Europe from 1944 until 1945.Gainor (2001), p. 68 After the war, the V-2 became the basis of early American and Soviet rocket designs.Schefter (1999), p. 29Siddiqi (2003a), p. 41

At war's end, American, British, and Soviet scientific intelligence teams competed to capture Germany's rocket engineers along with the German rockets themselves and the designs on which they were based.Siddiqi (2003a), p. 24–41 Each of the Allies captured a share of the available members of the German rocket team, but the United States benefited the most with Operation Paperclip, recruiting von Braun and most of his engineering team, who later helped develop the American missile and space exploration programs. The United States also acquired a large number of complete V2 rockets.

Soviet rocket development

thumb|"Chief Designer" Sergei Korolev (left), with the "father of the Soviet atomic bomb" Igor Kurchatov, and "Chief Theoretician" Mstislav Keldysh in 1956
The German rocket center in Peenemünde was located in the eastern part of Germany, which became the Soviet zone of occupation. On Stalin's orders, the Soviet Union sent its best rocket engineers to this region to see what they could salvage for future weapons systems.Siddiqi (2003a), pp. 24–34 The Soviet rocket engineers were led by Sergei Korolev. He had been involved in space clubs and early Soviet rocket design in the 1930s, but was arrested in 1938 during Joseph Stalin's Great Purge and imprisoned for six years in Gulag.Siddiqi (2003a), pp. 4, 11, 16 After the war, he became the USSR's chief rocket and spacecraft engineer, essentially the Soviet counterpart to von Braun.Schefter (1999), pp. 7–10 His identity was kept a state secret throughout the Cold War, and he was identified publicly only as "the Chief Designer." In the West, his name was only officially revealed when he died in 1966.

After almost a year in the area around Peenemünde, Soviet officials conducted Operation Osoaviakhim and later moved more than 170 of the top captured German rocket specialists to Gorodomlya Island on Lake Seliger, about  northwest of Moscow.Siddiqi (2003a), p. 45 They were not allowed to participate in final Soviet missile design, but were used as problem-solving consultants to the Soviet engineers. They helped in the following areas: the creation of a Soviet version of the A-4; work on "organizational schemes"; research in improving the A-4 main engine; development of a 100-ton engine; assistance in the "layout" of plant production rooms; and preparation of rocket assembly using German components. With their help, particularly Helmut Gröttrup's group, Korolev reverse-engineered the A-4 and built his own version of the rocket, the R-1, in 1948. Later, he developed his own distinct designs, though many of these designs were influenced by the Gröttrup Group's G4-R14 design from 1949. The Germans were eventually repatriated in 1952–53. Details of the German achievements and potential contributions to the Soviet rocket and space program were evaluated after their return from Gorodomlya.

American rocket development
The American professor Robert H. Goddard had worked on developing solid-propellant rockets since 1914, and demonstrated a light battlefield rocket to the US Army Signal Corps only five days before the signing of the armistice that ended World War I. He also started developing liquid-propellant rockets in 1921, yet he had not been taken seriously by the public.Goddard's 1919 research paper A Method of Reaching Extreme Altitudes was famously ridiculed in a New York Times editorial.

Von Braun and his team were sent to the United States Army's White Sands Proving Ground, located in New Mexico, in 1945.Burrows (1998), p. 123 They set about assembling the captured V2s and began a program of launching them and instructing American engineers in their operation.Burrows (1998), pp. 129–34 These tests led to the first photos of Earth from space, and the first two-stage rocket, the WAC Corporal-V2 combination, in 1949. The German rocket team was moved from Fort Bliss to the Army's new Redstone Arsenal, located in Huntsville, Alabama, in 1950.Burrows (1998), p. 137 From here, von Braun and his team developed the Army's first operational medium-range ballistic missile, the Redstone rocket, that in slightly modified versions, launched both America's first satellite, and the first piloted Mercury space missions. It became the basis for both the Jupiter and Saturn family of rockets.

Cold War missile race

The Cold War (1947–1991) developed between two former allies, the Soviet Union and the United States, soon after the end of the Second World War. It involved a continuing state of political conflict, military tension, proxy wars, and economic competition, primarily between the Soviet Union and its satellite states (often referred to as the Eastern Bloc) and the powers of the Western world, particularly the United States.Schmitz, (1999), pp. 149–54 The primary participants' military forces never clashed directly, but expressed this conflict through military coalitions, strategic conventional force deployments, extensive aid to states deemed vulnerable, proxy wars, espionage, propaganda, a nuclear arms race, and economic and technological competitions, such as the Space Race.

In simple terms, the Cold War could be viewed as an expression of the ideological struggle between communism and capitalism.Burrows (2012), pp. 147–49 The United States faced a new uncertainty beginning in September 1949, when it lost its monopoly on the atomic bomb. American intelligence agencies discovered that the Soviet Union had exploded its first atomic bomb, with the consequence that the United States potentially could face a future nuclear war that, for the first time, might devastate its cities. Given this new danger, the United States participated in an arms race with the Soviet Union that included development of the hydrogen bomb, as well as intercontinental strategic bombers and intercontinental ballistic missiles (ICBMs) capable of delivering nuclear weapons. A new fear of communism and its sympathizers swept the United States during the 1950s, which devolved into paranoid McCarthyism. With communism spreading in China, Korea, and Eastern Europe, Americans came to feel so threatened that popular and political culture condoned extensive "witch-hunts" to expose communist spies. Part of the American reaction to the Soviet atomic and hydrogen bomb tests included maintaining a large Air Force, under the control of the Strategic Air Command (SAC). SAC employed intercontinental strategic bombers, as well as medium-bombers based close to Soviet airspace (in western Europe and in Turkey) that were capable of delivering nuclear payloads.Polmer and Laur (1990), pp. 229–41

For its part, the Soviet Union harbored fears of invasion. Having suffered at least 27 million casualties during World War II after being invaded by Nazi Germany in 1941,Burrows (1998), pp. 149–51 the Soviet Union was wary of its former ally, the United States, which until late 1949 was the sole possessor of atomic weapons. The United States had used these weapons operationally during World War II, and it could use them again against the Soviet Union, laying waste to its cities and military centers. Since the Americans had a much larger air force than the Soviet Union, and the United States maintained advance air bases near Soviet territory, in 1947 Stalin ordered the development of intercontinental ballistic missiles (ICBMs) in order to counter the perceived American threat.Gatland (1976), pp. 100–01

thumb|Soviet R-7 ICBM, and its derivative launch vehicles for Sputnik, Vostok, Voskhod, and Soyuz

In 1953, Korolev was given the go-ahead to develop the R-7 Semyorka rocket, which represented a major advance from the German design. Although some of its components (notably boosters) still resembled the German G-4, the new rocket incorporated staged design, a completely new control system, and a new fuel. It was successfully tested on August 21, 1957, and became the world's first fully operational ICBM the following month.Hall & Shayler (2001), p. 56 It was later used to launch the first satellite into space, and derivatives launched all piloted Soviet spacecraft.Siddiqi (2003a), pp. 468–69

The United States had multiple rocket programs divided among the different branches of the American armed services, which meant that each force developed its own ICBM program. The Air Force initiated ICBM research in 1945 with the MX-774. However, its funding was cancelled and only three partially successful launches were conducted in 1947. In 1950, von Braun began testing the Air Force PGM-11 Redstone rocket family at Cape Canaveral. In 1951, the Air Force began a new ICBM program called MX-1593, and by 1955 this program was receiving top-priority funding. The MX-1593 program evolved to become the Atlas-A, with its maiden launch occurring June 11, 1957, becoming the first successful American ICBM. Its upgraded version, the Atlas-D rocket, later served as a nuclear ICBM and as the orbital launch vehicle for Project Mercury and the remote-controlled Agena Target Vehicle used in Project Gemini.

With the Cold War as an engine for change in the ideological competition between the United States and the Soviet Union, a coherent space policy began to take shape in the United States during the late 1950s.Burrows (1998), p. 138 Korolev took inspiration from the competition as well, achieving many firsts to counter the possibility that the United States might prevail.Siddiqi (2003a), p. 383

Competition begins

First artificial satellite
In 1955, with both the United States and the Soviet Union building ballistic missiles that could be utilized to launch objects into space, the stage was set for nationalistic competition.Schefter (1999), pp. 3–5 In separate announcements four days apart, both nations publicly announced that they would launch artificial Earth satellites by 1957 or 1958. On July 29, 1955, James C. Hagerty, President Dwight D. Eisenhower's press secretary, announced that the United States intended to launch "small Earth circling satellites" between July 1, 1957, and December 31, 1958, as part of the US contribution to the International Geophysical Year (IGY). Four days later, at the Sixth Congress of International Astronautical Federation in Copenhagen, scientist Leonid I. Sedov spoke to international reporters at the Soviet embassy and announced his country's intention to launch a satellite as well, in the "near future". On August 30, 1955, Korolev managed to get the Soviet Academy of Sciences to create a commission whose purpose was to beat the Americans into Earth orbit: this was the de facto start date for the Space Race. The Council of Ministers of the Soviet Union began a policy of treating development of its space program as classified information.

Initially, President Eisenhower was worried that a satellite passing above a nation at over  might be construed as violating that nation's sovereign airspace.Schefter (1999), p. 8 He was concerned that the Soviet Union would accuse the Americans of an illegal overflight, thereby scoring a propaganda victory at his expense.Schefter (1999), p. 6 Eisenhower and his advisors were of the opinion that a nation's airspace sovereignty did not extend past the Kármán line, and they used the 1957–58 International Geophysical Year launches to establish this principle in international law. Eisenhower also feared that he might cause an international incident and be called a "warmonger" if he were to use military missiles as launchers. Therefore, he selected the untried Naval Research Laboratory's Vanguard rocket, which was a research-only booster.Schefter (1999), pp. 15–18 This meant that von Braun's team was not allowed to put a satellite into orbit with their Jupiter-C rocket, because of its intended use as a future military vehicle. On September 20, 1956, von Braun and his team did launch a Jupiter-C that was capable of putting a satellite into orbit, but the launch was used only as a suborbital test of reentry vehicle technology.

Korolev received word about von Braun's 1956 Jupiter-C test and, mistakenly thinking it was a satellite mission that failed, expedited plans to get his own satellite in orbit. Since the R-7 was substantially more powerful than any of the US boosters, he made sure to take full advantage of this capability by designing Object D as his primary satellite.Cadbury (2006), pp. 154–57 It was given the designation 'D', to distinguish it from other R-7 payload designations 'A', 'B', 'V', and 'G' which were nuclear weapon payloads.Siddiqi (2003a), p. 151 Object D dwarfed the proposed US satellites, having a weight of , of which  would be composed of scientific instruments that would photograph the Earth, take readings on radiation levels, and check on the planet's magnetic field. However, things were not going along well with the design and manufacturing of the satellite, so in February 1957, Korolev sought and received permission from the Council of Ministers to build a Prosteishy Sputnik (PS-1), or simple satellite. The Council also decreed that Object D be postponed until April 1958.Siddiqi (2003a), p. 155 The new Sputnik was a metallic sphere that would be a much lighter craft, weighing  and having a  diameter. The satellite would not contain the complex instrumentation that Object D had, but had two radio transmitters operating on different short wave radio frequencies, the ability to detect if a meteoroid were to penetrate its pressure hull, and the ability to detect the density of the Earth's thermosphere.Hardesty (2007), pp. 72–73

Korolev was buoyed by the first successful launches of the R-7 rocket in August and September, which paved the way for the launch of Sputnik.Siddiqi (2003a), pp. 163–68 Word came that the US was planning to announce a major breakthrough at an International Geophysical Year conference at the National Academy of Sciences in Washington D.C., with a paper entitled "Satellite Over the Planet", on October 6, 1957.Cadbury (2006), p. 163 Korolev anticipated that von Braun might launch a Jupiter-C with a satellite payload on or around October 4 or 5, in conjunction with the paper. He hastened the launch, moving it to October 4. The launch vehicle for PS-1 was a modified R-7 – vehicle 8K71PS number M1-PS – without much of the test equipment and radio gear that was present in the previous launches. It arrived at the Soviet missile base Tyura-Tam in September and was prepared for its mission at launch site number one. The first launch took place on Friday, October 4, 1957 at exactly 10:28:34 pm Moscow time, with the R-7 and the now named Sputnik 1 satellite lifting off the launch pad and placing the artificial "moon" into an orbit a few minutes later.Hardesty (2007), p. 74 This "fellow traveler," as the name is translated in English, was a small, beeping ball, less than two feet in diameter and weighing less than 200 pounds. But the celebrations were muted at the launch control center until the down-range far east tracking station at Kamchatka received the first distinctive beep ... beep ... beep sounds from Sputnik 1s radio transmitters, indicating that it was on its way to completing its first orbit. About 95 minutes after launch, the satellite flew over its launch site, and its radio signals were picked up by the engineers and military personnel at Tyura-Tam: that's when Korolev and his team celebrated the first successful artificial satellite placed into Earth-orbit.Cadbury (2006), pp. 164–65

US reaction

The Soviet success raised a great deal of concern in the United States. For example, economist Bernard Baruch wrote in an open letter titled "The Lessons of Defeat" to the New York Herald Tribune: "While we devote our industrial and technological power to producing new model automobiles and more gadgets, the Soviet Union is conquering space. ... It is Russia, not the United States, who has had the imagination to hitch its wagon to the stars and the skill to reach for the moon and all but grasp it. America is worried. It should be."

Eisenhower ordered project Vanguard to move up its timetable and launch its satellite much sooner than originally planned.Brzezinski (2007), pp. 254–67 The December 6, 1957 Project Vanguard launch failure occurred at Cape Canaveral Air Force Station in Florida, broadcast live in front of a US television audience. It was a monumental failure, exploding a few seconds after launch, and it became an international joke. The satellite appeared in newspapers under the names Flopnik, Stayputnik, Kaputnik,O'Neill, Terry. The Nuclear Age. San Diego: Greenhaven, Inc., 2002.(146) and Dudnik.Knapp, Brian. Journey into Space. Danbury: Grolier, 2004.(17) In the United Nations, the Soviet delegate offered the US representative aid "under the Soviet program of technical assistance to backwards nations." Only in the wake of this very public failure did von Braun's Redstone team get the go-ahead to launch their Jupiter-C rocket as soon as they could. In Britain, the US's Western Cold War ally, the reaction was mixed: some celebrated the fact that the Soviets had reached space first, while others feared the destructive potential that military uses of spacecraft might bring.Barnett, Nicholas. '"Russia Wins Space Race": The British Press and the Sputnik Moment', Media History, (2013) 19:2, 182–95.

thumb|upright|William Hayward Pickering, James Van Allen, and Wernher von Braun display a full-scale model of Explorer 1 at a Washington, DC news conference after confirmation the satellite was in orbit

On January 31, 1958, nearly four months after the launch of Sputnik 1, von Braun and the United States successfully launched its first satellite on a four-stage Juno I rocket derived from the US Army's Redstone missile, at Cape Canaveral. The satellite Explorer 1 was  in mass.  The payload of Explorer 1 weighed . It carried a micrometeorite gauge and a Geiger-Müller tube. It passed in and out of the Earth-encompassing radiation belt with its  orbit, therefore saturating the tube's capacity and proving what Dr. James Van Allen, a space scientist at the University of Iowa, had theorized. The belt, named the Van Allen radiation belt, is a doughnut-shaped zone of high-level radiation intensity around the Earth above the magnetic equator. Van Allen was also the man who designed and built the satellite instrumentation of Explorer 1. The satellite measured three phenomena: cosmic ray and radiation levels, the temperature in the spacecraft, and the frequency of collisions with micrometeorites. The satellite had no memory for data storage, therefore it had to transmit continuously. In March 1958 a second satellite was sent into orbit with augmented cosmic ray instruments.

On April 2, 1958, President Eisenhower reacted to the Soviet space lead in launching the first satellite by recommending to the US Congress that a civilian agency be established to direct nonmilitary space activities. Congress, led by Senate Majority Leader Lyndon B. Johnson, responded by passing the National Aeronautics and Space Act, which Eisenhower signed into law on July 29, 1958. This law turned the National Advisory Committee on Aeronautics into the National Aeronautics and Space Administration (NASA). It also created a Civilian-Military Liaison Committee, appointed by the President, responsible for coordinating the nation's civilian and military space programs.

On October 21, 1959, Eisenhower approved the transfer of the Army's remaining space-related activities to NASA. On July 1, 1960, the Redstone Arsenal became NASA's George C. Marshall Space Flight Center, with von Braun as its first director. Development of the Saturn rocket family, which when mature gave the US parity with the Soviets in terms of lifting capability, was thus transferred to NASA.

Uncrewed lunar probes

In 1958, Korolev upgraded the R-7 to be able to launch a  payload to the Moon. Three secret 1958 attempts to launch Luna E-1-class impactor probes failed. The fourth attempt, Luna 1, launched successfully on January 2, 1959, but missed the Moon. The fifth attempt on June 18 also failed at launch. The  Luna 2 successfully impacted the Moon on September 14, 1959. The  Luna 3 successfully flew by the Moon and sent back pictures of its far side on October 6, 1959.

The US reacted to the Luna program by embarking on the Ranger program in 1959, managed by NASA's Jet Propulsion Laboratory. The Block I Ranger 1 and Ranger 2 suffered Atlas-Agena launch failures in August and November 1961. The  Block II Ranger 3 launched successfully on January 26, 1962, but missed the Moon. The  Ranger 4 became the first US spacecraft to reach the Moon, but its solar panels and navigational system failed near the Moon and it impacted the far side without returning any scientific data. Ranger 5 ran out of power and missed the Moon by  on October 21, 1962. The first successful Ranger mission was the  Block III Ranger 7 which impacted on July 31, 1964.

First human (Russian) in space
thumb|upright|Yuri Gagarin, the first person in space, 1961

By 1959, some American observers had predicted that the Soviet Union would be the first to get a human into space because of the time needed to prepare for Mercury's first launch. On April 12, 1961, the USSR surprised the world again by launching Yuri Gagarin into a single orbit around the Earth in a craft they called Vostok 1.Hall (2001), pp. 149–57 They dubbed Gagarin the first cosmonaut, roughly translated from Russian and Greek as "sailor of the universe". Although he had the ability to take control of his capsule in an emergency by opening an envelope he had in the cabin that contained a code that could be typed into the computer, it was flown in an automatic mode as a precaution; medical science at that time did not know what would happen to a human in the weightlessness of space. Vostok 1 orbited the Earth for 108 minutes and made its reentry over the Soviet Union, with Gagarin ejecting from the spacecraft at , and landing by parachute. The Fédération Aéronautique Internationale (International Federation of Aeronautics) credited Gagarin with the world's first human space flight, although their qualifying rules for aeronautical records at the time required pilots to take off and land with their craft. For this reason, the Soviet Union omitted from their FAI submission the fact that Gagarin did not land with his capsule. When the FAI filing for Gherman Titov's second Vostok flight in August 1961 disclosed the ejection landing technique, the FAI committee decided to investigate, and concluded that the technological accomplishment of human spaceflight lay in the safe launch, orbiting, and return, rather than the manner of landing, and revised their rules, keeping Gagarin's and Titov's records intact.

Gagarin became a national hero of the Soviet Union and the Eastern Bloc, and a worldwide celebrity. Moscow and other cities in the USSR held mass demonstrations, the scale of which was second only to the World War II Victory Parade of 1945.Pervushin (2011), 7.1 Гражданин мира April 12 was declared Cosmonautics Day in the USSR, and is celebrated today in Russia as one of the official "Commemorative Dates of Russia." In 2011, it was declared the International Day of Human Space Flight by the United Nations.

The radio communication between the launch control room and Gagarin included the following dialogue at the moment of rocket launch:

Gagarin's informal poyekhali! became a historical phrase in the Eastern Bloc, used to refer to the beginning of the human space flight era.Pervushin (2011), 6.2 Он сказал «Поехали!»

First American in space
thumb|right|Alan Shepard, the first American in space, 1961
The US Air Force had been developing a program to launch the first man in space, named Man in Space Soonest. This program studied several different types of one-man space vehicles, settling on a ballistic re-entry capsule launched on a derivative Atlas missile, and selecting a group of nine candidate pilots. After NASA's creation, the program was transferred over to the civilian agency and renamed Project Mercury on November 26, 1958. NASA selected a new group of astronaut (from the Greek for "star sailor") candidates from Navy, Air Force and Marine test pilots, and narrowed this down to a group of seven for the program. Capsule design and astronaut training began immediately, working toward preliminary suborbital flights on the Redstone missile, followed by orbital flights on the Atlas. Each flight series would first start uncrewed, then carry a non-human primate, then finally humans.

On May 5, 1961, Alan Shepard became the first American in space, launching in a ballistic trajectory on Mercury-Redstone 3, in a spacecraft he named Freedom 7.Schefter (1999), pp. 138–43 Though he did not achieve orbit like Gagarin, he was the first person to exercise manual control over his spacecraft's attitude and retro-rocket firing.Gatland (1976), pp. 153–54 After his successful return, Shepard was celebrated as a national hero, honored with parades in Washington, New York and Los Angeles, and received the NASA Distinguished Service Medal from President John F. Kennedy.

Kennedy aims for the Moon

Before Gagarin's flight, US President John F. Kennedy's support for America's crewed space program was lukewarm. Jerome Wiesner of MIT, who served as a science advisor to presidents Eisenhower and Kennedy, and himself an opponent of crewed space exploration, remarked, "If Kennedy could have opted out of a big space program without hurting the country in his judgment, he would have."Quoted in John M. Logsdon, The Decision to Go to the Moon: Project Apollo and the National Interest (Cambridge, MA: MIT Press, 1970) p. 111. As late as March 1961, when NASA administrator James E. Webb submitted a budget request to fund a Moon landing before 1970, Kennedy rejected it because it was simply too expensive.David E. Bell, Memorandum for the President, "National Aeronautics and Space Administration Budget Problem," March 22, 1961, NASA Historical Reference Collection; U.S. Congress, House, Committee of Science and Astronautics, NASA Fiscal 1962 Authorization, Hearings, 87th Cong., 1st. sess., 1962, pp. 203, 620; Logsdon, Decision to go to the Moon, pp. 94–100. Some were surprised by Kennedy's eventual support of NASA and the space program because of how often he had attacked the Eisenhower administration's inefficiency during the election.Wolfe, Tom. The Right Stuff. New York: Picador, 1979.(179)

Gagarin's flight changed this; now Kennedy sensed the humiliation and fear on the part of the American public over the Soviet lead. Additionally, the Bay of Pigs invasion, planned before his term began but executed during it, was an embarrassment to his administration due to the colossal failure of the US forces.Roger D. Launius and Howard E. McCurdy, eds, Spaceflight and the Myth of Presidential Leadership (Champaign, IL: University of Illinois Press, 1997), 56. Looking for something to save political face, he sent a memo dated April 20, 1961, to Vice President Lyndon B. Johnson, asking him to look into the state of America's space program, and into programs that could offer NASA the opportunity to catch up.Kennedy to Johnson,"Memorandum for Vice President," April 20, 1961. The two major options at the time were either the establishment of an Earth orbital space station or a crewed landing on the Moon. Johnson, in turn, consulted with von Braun, who answered Kennedy's questions based on his estimates of US and Soviet rocket lifting capability.von Braun to Johnson,Untitled, April 29, 1961. Based on this, Johnson responded to Kennedy, concluding that much more was needed to reach a position of leadership, and recommending that the crewed Moon landing was far enough in the future that the US had a fighting chance to achieve it first.Johnson to Kennedy,"Evaluation of Space Program," April 28, 1961.

Kennedy ultimately decided to pursue what became the Apollo program, and on May 25 took the opportunity to ask for Congressional support in a Cold War speech titled "Special Message on Urgent National Needs". 
He justified the program in terms of its importance to national security, and its focus of the nation's energies on other scientific and social fields. He rallied popular support for the program in his "We choose to go to the Moon" speech, on September 12, 1962, before a large crowd at Rice University Stadium, in Houston, Texas, near the construction site of the new Lyndon B. Johnson Space Center facility. 
Khrushchev responded to Kennedy's implicit challenge with silence, refusing to publicly confirm or deny the Soviets were pursuing a "Moon race". As later disclosed, the Soviet Union secretly pursued a crewed lunar program until 1974.

Completion of Vostok and Mercury programs

Mercury

thumb|right|John Glenn, the first American in orbit, 1962
American Virgil "Gus" Grissom repeated Shepard's suborbital flight in Liberty Bell 7 on July 21, 1961. Almost a year after the Soviet Union put a human into orbit, astronaut John Glenn became the first American to orbit the Earth, on February 20, 1962.Schefter (1999), pp. 156–64 His Mercury-Atlas 6 mission completed three orbits in the Friendship 7 spacecraft, and splashed down safely in the Atlantic Ocean, after a tense reentry, due to what falsely appeared from the telemetry data to be a loose heat-shield. As the first American in orbit, Glenn became a national hero, and received a ticker-tape parade in New York City, reminiscent of that given for Charles Lindbergh. On February 23, 1962, President Kennedy escorted him in a parade at Cape Canaveral Air Force Station, where he awarded Glenn with the NASA service medal.

The United States launched three more Mercury flights after Glenn's: Aurora 7 on May 24, 1962 duplicated Glenn's three orbits, Sigma 7 on October 3, 1962 six orbits, and Faith 7 on May 15, 1963 22 orbits (32.4 hours), the maximum capability of the spacecraft. NASA at first intended to launch one more mission, extending the spacecraft's endurance to three days, but since this would not beat the Soviet record, it was decided instead to concentrate on developing Project Gemini.

Vostok
thumb|upright|left|Replica of the Vostok capsule
Gherman Titov became the first Soviet cosmonaut to exercise manual control of his Vostok 2 craft on August 6, 1961.Gatland (1976), pp. 115–16 The Soviet Union demonstrated 24-hour launch pad turnaround and the capability to launch two piloted spacecraft, Vostok 3 and Vostok 4, in essentially identical orbits, on August 11 and 12, 1962.Hall (2001), pp. 183, 192 The two spacecraft came within approximately  of one another, close enough for radio communication.Gatland (1976), pp. 117–18 Vostok 4 also set a record of nearly four days in space. Though the two craft's orbits were as nearly identical as possible given the accuracy of the launch rocket's guidance system, slight variations still existed which drew the two craft at first as close to each other as , then as far apart as . There were no maneuvering rockets on the Vostok to permit space rendezvous, required to keep two spacecraft a controlled distance apart.Hall (2001), pp. 185–91
thumb|upright|Valentina Tereshkova
The Soviet Union duplicated its dual-launch feat with Vostok 5 and Vostok 6 (June 16, 1963). This time they launched the first woman (also the first civilian), Valentina Tereshkova, into space on Vostok 6.Hall(2001), pp. 194–218 Launching a woman was reportedly Korolev's idea, and it was accomplished purely for propaganda value. Tereshkova was one of a small corps of female cosmonauts who were amateur parachutists, but Tereshkova was the only one to fly. The USSR didn't again open its cosmonaut corps to women until 1980, two years after the United States opened its astronaut corps to women.

The Soviets kept the details and true appearance of the Vostok capsule secret until the April 1965 Moscow Economic Exhibition, where it was first displayed without its aerodynamic nose cone concealing the spherical capsule. The "Vostok spaceship" had been first displayed at the July 1961 Tushino air show, mounted on its launch vehicle's third stage, with the nose cone in place. A tail section with eight fins was also added, in an apparent attempt to confuse western observers. This spurious tail section also appeared on official commemorative stamps and a documentary.Gatland (1976), p. 254

Kennedy proposes a joint US-USSR program
After a first US-USSR Dryden-Blagonravov agreement and cooperation on the Echo II balloon satellite in 1962, President Kennedy proposed on September 20, 1963, in a speech before the United Nations General Assembly, that the United States and the Soviet Union join forces in an effort to reach the Moon. Kennedy thus changed his mind regarding the desirability of the space race, preferring instead to ease tensions with the Soviet Union by cooperating on projects such as a joint lunar landing.Stone, Oliver and Peter Kuznick, "The Untold History of the United States" (Gallery Books, 2012), p. 320  Soviet Premier Nikita Khrushchev initially rejected Kennedy's proposal. However, on October 2, 1997, it was reported that Khrushchev's son Sergei claimed Khrushchev was poised to accept Kennedy's proposal at the time of Kennedy's assassination on November 22, 1963. During the next few weeks he reportedly concluded that both nations might realize cost benefits and technological gains from a joint venture, and decided to accept Kennedy's offer based on a measure of rapport during their years as leaders of the world's two superpowers, but changed his mind and dropped the idea since he did not have the same trust for Kennedy's successor, Lyndon Johnson.

As President, Johnson steadfastly pursued the Gemini and Apollo programs, promoting them as Kennedy's legacy to the American public. One week after Kennedy's death, he issued an executive order renaming the Cape Canaveral and Apollo launch facilities after Kennedy.

Gemini and Voskhod
Focused by the commitment to a Moon landing, in January 1962 the US announced Project Gemini, a two-person spacecraft that would support the later three-person Apollo by developing the key spaceflight technologies of space rendezvous and docking of two craft, flight durations of sufficient length to simulate going to the Moon and back, and extra-vehicular activity to accomplish useful work outside the spacecraft.

Meanwhile, Korolev had planned further, long-term missions for the Vostok spacecraft, and had four Vostoks in various stages of fabrication in late 1963 at his OKB-1 facilities.Siddiqi (2003a), pp. 384–86 At that time, the Americans announced their ambitious plans for the Project Gemini flight schedule. These plans included major advancements in spacecraft capabilities, including a two-person spacecraft, the ability to change orbits, the capacity to perform an extravehicular activity (EVA), and the goal of docking with another spacecraft. These represented major advances over the previous Mercury or Vostok capsules, and Korolev felt the need to try to beat the Americans to many of these innovations. Korolev already had begun designing the Vostok's replacement, the next-generation Soyuz spacecraft, a multi-cosmonaut spacecraft that had at least the same capabilities as the Gemini spacecraft.Schefter (1999), p. 149 Soyuz would not be available for at least three years, and it could not be called upon to deal with this new American challenge in 1964 or 1965.Schefter (1999), p. 198 Political pressure in early 1964which some sources claim was from Khrushchev while other sources claim was from other Communist Party officialspushed him to modify his four remaining Vostoks to beat the Americans to new space firsts in the size of flight crews, and the duration of missions.

Voskhod program

thumb|upright|The Voskhod 1 and 2 space capsules

The greater advances of the Soviet space program at the time allowed their space program to achieve other significant firsts, including the first ever "spacewalk". Gemini took a year longer than planned to accomplish its first flight, allowing the Soviets to achieve another first, launching the first spacecraft with a three-cosmonaut crew, Voskhod 1, on October 12, 1964. The USSR touted another technological achievement during this mission: it was the first space flight during which cosmonauts performed in a shirt-sleeve-environment.Schefter (1999), pp. 199–200 However, flying without spacesuits was not due to safety improvements in the Soviet spacecraft's environmental systems; rather this innovation was accomplished because the craft's limited cabin space did not allow for spacesuits. Flying without spacesuits exposed the cosmonauts to significant risk in the event of potentially fatal cabin depressurization. This feat was not repeated until the US Apollo Command Module flew in 1968; this later mission was designed from the outset to safely transport three astronauts in a shirt-sleeve environment while in space.

By October 16, 1964, Leonid Brezhnev and a small cadre of high-ranking Communist Party officials deposed Khrushchev as Soviet government leader a day after Voskhod 1 landed, in what was called the "Wednesday conspiracy".
The new political leaders, along with Korolev, ended the technologically troublesome Voskhod program, cancelling Voskhod 3 and 4, which were in the planning stages, and started concentrating on reaching the Moon.Siddiqi (2003a), pp. 510–11 Voskhod 2 ended up being Korolev's final achievement before his death on January 14, 1966, as it became the last of the many space firsts that demonstrated the USSR's domination in spacecraft technology during the early 1960s. According to historian Asif Siddiqi, Korolev's accomplishments marked "the absolute zenith of the Soviet space program, one never, ever attained since."Siddiqi (2003a), p. 460 There was a two-year pause in Soviet piloted space flights while Voskhod's replacement, the Soyuz spacecraft, was designed and developed.Schefter (1999), p. 207

On March 18, 1965, about a week before the first piloted Project Gemini space flight, the USSR launched the two-cosmonaut Voskhod 2 mission with Pavel Belyayev and Alexei Leonov. Voskhod 2's design modifications included the addition of an inflatable airlock to allow for extravehicular activity (EVA), also known as a spacewalk, while keeping the cabin pressurized so that the capsule's electronics would not overheat.Siddiqi (2003a), p. 448 Leonov performed the first-ever EVA as part of the mission. A fatality was narrowly avoided when Leonov's spacesuit expanded in the vacuum of space, preventing him from re-entering the airlock.Schefter (1999), p. 205 In order to overcome this, he had to partially depressurize his spacesuit to a potentially dangerous level. He succeeded in safely re-entering the ship, but he and Belyayev faced further challenges when the spacecraft's atmospheric controls flooded the cabin with 45% pure oxygen, which had to be lowered to acceptable levels before re-entry. The reentry involved two more challenges: an improperly timed retrorocket firing caused the Voskhod 2 to land  off its designated target area, the city of Perm; and the instrument compartment's failure to detach from the descent apparatus caused the spacecraft to become unstable during reentry.Siddiqi (2003a), pp. 454–60

center|thumb|upright=2.0|Progress in the Space Race, showing the US passing the Soviets in 1965

Project Gemini

thumb|Rendezvous of Gemini 6 and 7, December 1965
Though delayed a year to reach its first flight, Gemini was able to take advantage of the USSR's two-year hiatus after Voskhod, which enabled the US to catch up and surpass the previous Soviet lead in piloted spaceflight. Gemini achieved several significant firsts during the course of ten piloted missions:
 On Gemini 3 (March 1965), astronauts Virgil "Gus" Grissom and John W. Young became the first to demonstrate their ability to change their craft's orbit.
 On Gemini 4 (June 1965), Ed White performed the first US spacewalk.
 On Gemini 5 (August 1965), astronauts L. Gordon Cooper and Charles "Pete" Conrad set a record of almost eight days in space, long enough for a piloted lunar mission.
 On Gemini 6A (December 1965), Command Pilot Wally Schirra achieved the first space rendezvous with Gemini 7, accurately matching his orbit to that of the other craft, station-keeping for three consecutive orbits at distances as close as .
 Gemini 7 also set a human spaceflight endurance record of fourteen days for Frank Borman and James A. Lovell, which stood until both nations started launching space laboratories in the early 1970s.
 On Gemini 8 (March 1966), Command Pilot Neil Armstrong achieved the first docking between two spacecraft, his Gemini craft and an Agena target vehicle.
 Gemini 11 (September 1966), commanded by Conrad, achieved the first direct-ascent rendezvous with its Agena target on the first orbit, and used the Agena's rocket to achieve an apogee of , the crewed Earth orbit record still current as of 2015.
 On Gemini 12 (November 1966), Edwin "Buzz" Aldrin spent over five hours working comfortably during three (EVA) sessions, finally proving that humans could perform productive tasks outside their spacecraft.

Most of the novice pilots on the early missions would command the later missions. In this way, Project Gemini built up spaceflight experience for the pool of astronauts for the Apollo lunar missions.

Soviet crewed Moon programs

Korolev's design bureau produced two prospectuses for circumlunar spaceflight (March 1962 and May 1963), the main spacecraft for which were early versions of his Soyuz design. Soviet Communist Party Central Committee Command 655-268 officially established two secret, competing crewed programs for circumlunar flights and lunar landings, on August 3, 1964. The circumlunar flights were planned to occur in 1967, and the landings to start in 1968.Portree, Part 1–1.2 Historical Overview

The circumlunar program (Zond), created by Vladimir Chelomey's design bureau OKB-52, was to fly two cosmonauts in a stripped-down Soyuz 7K-L1, launched by Chelomey's Proton UR-500 rocket. The Zond sacrificed habitable cabin volume for equipment, by omitting the Soyuz orbital module. Chelomey gained favor with Khrushchev by employing members of his family.

Korolev's lunar landing program was designated N1/L3, for its N1 super rocket and a more advanced Soyuz 7K-L3 spacecraft, also known as the lunar orbital module ("Lunniy Orbitalny Korabl", LOK), with a crew of two. A separate lunar lander ("Lunniy Korabl", LK), would carry a single cosmonaut to the lunar surface.

The N1/L3 launch vehicle had three stages to Earth orbit, a fourth stage for Earth departure, and a fifth stage for lunar landing assist. The combined space vehicle was roughly the same height and takeoff mass as the three-stage US Apollo/ Saturn V and exceeded its takeoff thrust by 28%, but had only roughly half the translunar injection payload capability.

Following Khrushchev's ouster from power, Chelomey's Zond program was merged into the N1/L3 program.

Outer space treaty
The US and USSR began discussions on the peaceful uses of space as early as 1958, presenting issues for debate to the United Nations,inesap.org  Peaceful Uses of Outer Space and International Law.Google books Nuclear Weapons and Contemporary International Law N. Singh, E. WcWhinney (p. 289)UN website UN Resolution 1348 (XIII).  which created a Committee on the Peaceful Uses of Outer Space in 1959.

On May 10, 1962, Vice President Johnson addressed the Second National Conference on the Peaceful Uses of Space revealing that the United States and the USSR both supported a resolution passed by the Political Committee of the UN General Assembly in December 1962, which not only urged member nations to "extend the rules of international law to outer space," but to also cooperate in its exploration. Following the passing of this resolution, Kennedy commenced his communications proposing a cooperative American/Soviet space program.Papers of John F. Kennedy. Presidential Papers. National Security Files. Subjects. Space activities: US/USSR cooperation, 1961–96

The UN ultimately created a Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, including the Moon and Other Celestial Bodies, which was signed by the United States, USSR, and the United Kingdom on January 27, 1967, and went into force the following October 10.

This treaty:
 bars party States from placing weapons of mass destruction in Earth orbit, on the Moon, or any other celestial body;
 exclusively limits the use of the Moon and other celestial bodies to peaceful purposes, and expressly prohibits their use for testing weapons of any kind, conducting military maneuvers, or establishing military bases, installations, and fortifications;
 declares that the exploration of outer space shall be done to benefit all countries and shall be free for exploration and use by all the States;
 explicitly forbids any government from claiming a celestial resource such as the Moon or a planet, claiming that they are the common heritage of mankind, "not subject to national appropriation by claim of sovereignty, by means of use or occupation, or by any other means". However, the State that launches a space object retains jurisdiction and control over that object;
 holds any State liable for damages caused by their space object;
 declares that "the activities of non-governmental entities in outer space, including the Moon and other celestial bodies, shall require authorization and continuing supervision by the appropriate State Party to the Treaty", and "States Parties shall bear international responsibility for national space activities whether carried out by governmental or non-governmental entities"; and
 "A State Party to the Treaty which has reason to believe that an activity or experiment planned by another State Party in outer space, including the Moon and other celestial bodies, would cause potentially harmful interference with activities in the peaceful exploration and use of outer space, including the Moon and other celestial bodies, may request consultation concerning the activity or experiment."

The treaty remains in force, signed by 107 member states. – 

Disaster strikes both sides
In 1967, both nations faced serious challenges that brought their programs to temporary halts. Both had been rushing at full-speed toward the first piloted flights of Apollo and Soyuz, without paying due diligence to growing design and manufacturing problems. The results proved fatal to both pioneering crews.

thumb|left|Charred interior of the Apollo 1 spacecraft after the fire that killed the first crew
On January 27, 1967, the same day the US and USSR signed the Outer Space Treaty, the crew of the first crewed Apollo mission, Command Pilot Virgil "Gus" Grissom, Senior Pilot Ed White, and Pilot Roger Chaffee, were killed in a fire that swept through their spacecraft cabin during a ground test, less than a month before the planned February 21 launch. An investigative board determined the fire was probably caused by an electrical spark and quickly grew out of control, fed by the spacecraft's pure oxygen atmosphere. Crew escape was made impossible by inability to open the plug door hatch cover against the greater-than-atmospheric internal pressure. The board also found design and construction flaws in the spacecraft, and procedural failings, including failure to appreciate the hazard of the pure-oxygen atmosphere, as well as inadequate safety procedures. All these flaws had to be corrected over the next twenty-two months until the first piloted flight could be made.
Mercury and Gemini veteran Grissom had been a favored choice of Deke Slayton, NASA's Director of Flight Crew Operations, to make the first piloted landing.

thumb|Commemorative plaque and the Fallen Astronaut sculpture left on the Moon in 1971 by the crew of Apollo 15 in memory of 14 deceased NASA astronauts and USSR cosmonauts
On April 24, 1967, the single pilot of Soyuz 1, Vladimir Komarov, became the first in-flight spaceflight fatality. The mission was planned to be a three-day test, to include the first Soviet docking with an unpiloted Soyuz 2, but the mission was plagued with problems. Early on, Komarov's craft lacked sufficient electrical power because only one of two solar panels had deployed. Then the automatic attitude control system began malfunctioning and eventually failed completely, resulting in the craft spinning wildly. Komarov was able to stop the spin with the manual system, which was only partially effective. The flight controllers aborted his mission after only one day. During the emergency re-entry, a fault in the landing parachute system caused the primary chute to fail, and the reserve chute became tangled with the drogue chute, causing descent speed to reach as high as 40 m/s (140 km/h; 89 mph). Shortly thereafter, Soyuz 1 impacted the ground 3 km (1.9 mi) west of Karabutak, exploding into a ball of flames. The official autopsy states Komarov died of blunt force trauma on impact, and that the subsequent heat mutilation of his corpse was a result of the explosive impact. Fixing the spacecraft's faults caused an eighteen-month delay before piloted Soyuz flights could resume.

Onward to the Moon
The United States recovered from the Apollo 1 fire, fixing the fatal flaws in an improved version of the Block II command module. The US proceeded with unpiloted test launches of the Saturn V launch vehicle (Apollo 4 and Apollo 6) and the Lunar Module (Apollo 5) during the latter half of 1967 and early 1968.Cadbury (2006), pp. 310–12, 314–16 Apollo 1's mission to check out the Apollo Command/Service Module in Earth orbit was accomplished by Grissom's backup crew commanded by Walter Schirra on Apollo 7, launched on October 11, 1968.Burrows (1999), p. 417 The eleven-day mission was a total success, as the spacecraft performed a virtually flawless mission, paving the way for the United States to continue with its lunar mission schedule.Murray (1990), pp. 323–24

thumb|left|Soyuz 4 and Soyuz 5 after docking, artist view

The Soviet Union also fixed the parachute and control problems with Soyuz, and the next piloted mission Soyuz 3 was launched on October 26, 1968.Hall (2003), pp. 144–47 The goal was to complete Komarov's rendezvous and docking mission with the un-piloted Soyuz 2. Ground controllers brought the two craft to within  of each other, then cosmonaut Georgy Beregovoy took control. He got within  of his target, but was unable to dock before expending 90 percent of his maneuvering fuel, due to a piloting error that put his spacecraft into the wrong orientation and forced Soyuz 2 to automatically turn away from his approaching craft. The first docking of Soviet spacecraft was finally realized in January 1969 by the Soyuz 4 and Soyuz 5 missions. It was the first-ever docking of two crewed spacecraft, and the first transfer of crew from one space vehicle to another.Soyuz 4  and Soyuz 5  on Encyclopedia Astronautica

thumb|Soyuz 7K-L1 Zond spacecraft, artist view

The Soviet Zond spacecraft was not yet ready for piloted circumlunar missions in 1968, after five unsuccessful and partially successful automated test launches: Cosmos 146 on March 10, 1967; Cosmos 154 on April 8, 1967; Zond 1967A September 27, 1967; Zond 1967B on November 22, 1967. Zond 4 was launched on March 2, 1968, and successfully made a circumlunar flight.Siddiqi (2003b), pp. 616, 618 After its successful flight around the Moon, Zond 4 encountered problems with its Earth reentry on March 9, and was ordered destroyed by an explosive charge  over the Gulf of Guinea.Hall (2003), p. 25 The Soviet official announcement said that Zond 4 was an automated test flight which ended with its intentional destruction, due to its recovery trajectory positioning it over the Atlantic Ocean instead of over the USSR.
alt=|left|thumb|Earthrise, as seen from Apollo 8, December 24, 1968 (photograph by astronaut William Anders)
During the summer of 1968, the Apollo program hit another snag: the first pilot-rated Lunar Module (LM) was not ready for orbital tests in time for a December 1968 launch. NASA planners overcame this challenge by changing the mission flight order, delaying the first LM flight until March 1969, and sending Apollo 8 into lunar orbit without the LM in December.Kraft (2001), pp. 284–97 This mission was in part motivated by intelligence rumors the Soviet Union might be ready for a piloted Zond flight during late 1968.Chaikin (1994), pp. 57–58 In September 1968, Zond 5 made a circumlunar flight with tortoises on board and returned safely to Earth, accomplishing the first successful water landing of the Soviet space program in the Indian Ocean.Siddiqi (2003b), pp. 654–56 It also scared NASA planners, as it took them several days to figure out that it was only an automated flight, not piloted, because voice recordings were transmitted from the craft en route to the Moon.Turnhill (2003), p. 134 On November 10, 1968, another automated test flight, Zond 6, was launched. It encountered difficulties in Earth reentry, and depressurized and deployed its parachute too early, causing it to crash-land only  from where it had been launched six days earlier.Siddiqi (2003b), pp. 663–66 It turned out there was no chance of a piloted Soviet circumlunar flight during 1968, due to the unreliability of the Zonds.Cadbury (2006), pp. 318–19

thumb|Lunar Module in lunar orbit on Apollo 10, May 22–23, 1969

On December 21, 1968, Frank Borman, James Lovell, and William Anders became the first humans to ride the Saturn V rocket into space, on Apollo 8. They also became the first to leave low-Earth orbit and go to another celestial body, entering lunar orbit on December 24.Poole (2008), pp. 19–34 They made ten orbits in twenty hours, and transmitted one of the most watched TV broadcasts in history, with their Christmas Eve program from lunar orbit, which concluded with a reading from the biblical Book of Genesis. Two and a half hours after the broadcast, they fired their engine to perform the first trans-Earth injection to leave lunar orbit and return to the Earth. Apollo 8 safely landed in the Pacific Ocean on December 27, in NASA's first dawn splashdown and recovery.

The American Lunar Module was finally ready for a successful piloted test flight in low Earth orbit on Apollo 9 in March 1969. The next mission, Apollo 10, conducted a "dress rehearsal" for the first landing in May 1969, flying the LM in lunar orbit as close as  above the surface, the point where the powered descent to the surface would begin. With the LM proven to work well, the next step was to attempt the landing.

Unknown to the Americans, the Soviet Moon program was in deep trouble. After two successive launch failures of the N1 rocket in 1969, Soviet plans for a piloted landing suffered delay.Siddiqi (2003b), pp. 665, 832–34 The launch pad explosion of the N-1 on July 3, 1969, was a significant setback.Siddiqi (2003b), pp. 690–93 The rocket hit the pad after an engine shutdown, destroying itself and the launch facility. Without the N-1 rocket, the USSR could not send a large enough payload to the Moon to land a human and return him safely.Parry (2009), pp. 178–79

Apollo 11

thumb|American Buzz Aldrin during the first Moon walk in 1969
Apollo 11 was prepared with the goal of a July landing in the Sea of Tranquility.Parry (2009), pp. 144–51 The crew, selected in January 1969, consisted of commander (CDR) Neil Armstrong, Command Module Pilot (CMP) Michael Collins, and Lunar Module Pilot (LMP) Edwin "Buzz" Aldrin.Chaikin (1994), p. 138 They trained for the mission until just before the launch day.Chaikin (1994), pp. 163–83 On July 16, 1969, at exactly 9:32 am EDT, the Saturn V rocket, AS-506, lifted off from Kennedy Space Center Launch Complex 39 in Florida.Parry (2009), pp. 38–44

The trip to the Moon took just over three days. After achieving orbit, Armstrong and Aldrin transferred into the Lunar Module, named Eagle, and after a landing gear inspection by Collins remaining in the Command/Service Module Columbia, began their descent. After overcoming several computer overload alarms caused by an antenna switch left in the wrong position, and a slight downrange error, Armstrong took over manual flight control at about , and guided the Lunar Module to a safe landing spot at 20:18:04 UTC, July 20, 1969 (3:17:04 pm CDT). The first humans on the Moon waited six hours before they left their craft. At 02:56 UTC, July 21 (9:56 pm CDT July 20), Armstrong became the first human to set foot on the Moon.

The first step was witnessed by at least one-fifth of the population of Earth, or about 723 million people. His first words when he stepped off the LM's landing footpad were, "That's one small step for [a] man, one giant leap for mankind."Murray (1990), p. 356 Aldrin joined him on the surface almost 20 minutes later. Altogether, they spent just under two and one-quarter hours outside their craft. Mission elapsed time (MET) from when Armstrong states that he will step off the LM at 109hrs:24mins:13secs to when Armstrong was back inside the LM at 111hrs:38mins:38sec The next day, they performed the first launch from another celestial body, and rendezvoused back with Columbia.Parry (2009), pp. 250–51

Apollo 11 left lunar orbit and returned to Earth, landing safely in the Pacific Ocean on July 24, 1969.Parry (2009), pp. 252–62 When the spacecraft splashed down, 2,982 days had passed since Kennedy's commitment to landing a man on the Moon and returning him safely to the Earth before the end of the decade; the mission was completed with 161 days to spare.Murray (1990), p. 347 With the safe completion of the Apollo 11 mission, the Americans won the race to the Moon.Schefter (1999), p. 288

Competition winds down
thumb|right|Apollo 17's Saturn V in 1972
thumb|right|Moonwalk, December 13, 1972
NASA had ambitious follow-on human spaceflight plans as it reached its lunar goal, but soon discovered it had expended most of its political capital to do so.Hepplewhite, p. 186

The first landing was followed by another, precision landing on Apollo 12 in November 1969. NASA had achieved its first landing goal with enough Apollo spacecraft and Saturn V launchers left for eight follow-on lunar landings through Apollo 20, conducting extended-endurance missions and transporting the landing crews in Lunar Roving Vehicles on the last five. They also planned an Apollo Applications Program to develop a longer-duration Earth orbital workshop (later named Skylab) to be constructed in orbit from a spent S-IVB upper stage, using several launches of the smaller Saturn IB launch vehicle. But planners soon decided this could be done more efficiently by using the two live stages of a Saturn V to launch the workshop pre-fabricated from an S-IVB (which was also the Saturn V third stage), which immediately removed Apollo 20. Budget cuts soon led NASA to cut Apollo 18 and 19 as well, but keep three extended/Lunar Rover missions. Apollo 13 encountered an in-flight spacecraft failure and had to abort its lunar landing in April 1970, returning its crew safely but temporarily grounding the program again. It resumed with four successful landings on Apollo 14 (February 1971), Apollo 15 (July 1971), Apollo 16 (April 1972), and Apollo 17 (December 1972).

In February 1969, President Richard M. Nixon convened a Space Task Group to set recommendations for the future US civilian space program, headed by his Vice President Spiro T. Agnew.Hepplewhite, p. 123 Agnew was an enthusiastic proponent of NASA's follow-on plans, and the STG recommended plans to develop a reusable Space Transportation System including a Space Shuttle, which would facilitate development of permanent space stations in Earth and lunar orbit, perhaps a base on the lunar surface, and the first human flight to Mars as early as 1986 or as late as 2000.Hepplewhite, pp. 136–50 Nixon had a better sense of the declining political support in Congress for a new Apollo-style program, which had disappeared with the achievement of the landing, and he intended to pursue detente with the USSR and China, which he hoped might ease Cold War tensions. He cut the spending proposal he sent to Congress to include funding for only the Space Shuttle, with perhaps an option to pursue the Earth orbital space station for the foreseeable future.Hepplewhite, pp. 150–77

The USSR continued trying to perfect their N1 rocket, finally canceling it in 1976, after two more launch failures in 1971 and 1972.Portree, 1.2.4 Manned Lunar Program (1964–1976)

Salyuts and Skylab
thumb|right|The Soyuz 11 crew with the Salyut station in the background, in a Soviet commemorative stamp
Having lost the race to the Moon, the USSR decided to concentrate on orbital space stations. During 1969 and 1970, they launched six more Soyuz flights after Soyuz 3, then launched the first space station, the Salyut 1 laboratory designed by Kerim Kerimov, on April 19, 1971.  Three days later, the Soyuz 10 crew attempted to dock with it, but failed to achieve a secure enough connection to safely enter the station. The Soyuz 11 crew of Vladislav Volkov, Georgi Dobrovolski and Viktor Patsayev successfully docked on June 7, and completed a record 22-day stay. The crew became the second in-flight space fatality during their reentry on June 30. They were asphyxiated when their spacecraft's cabin lost all pressure, shortly after undocking. The disaster was blamed on a faulty cabin pressure valve, that allowed all the air to vent into space. The crew was not wearing pressure suits and had no chance of survival once the leak occurred.

Salyut 1's orbit was increased to prevent premature reentry, but further piloted flights were delayed while the Soyuz was redesigned to fix the new safety problem. The station re-entered the Earth's atmosphere on October 11, after 175 days in orbit. The USSR attempted to launch a second Salyut-class station designated Durable Orbital Station-2 (DOS-2) on July 29, 1972, but a rocket failure caused it to fail to achieve orbit. After the DOS-2 failure, the USSR attempted to launch four more Salyut-class stations up to 1975, with another failure due to an explosion of the final rocket stage, which punctured the station with shrapnel so that it would not hold pressure. All of the Salyuts were presented to the public as non-military scientific laboratories, but some of them were covers for the military Almaz reconnaissance stations.

The United States launched the orbital workstation Skylab 1 on May 14, 1973. It weighed , was  long by  in diameter, and had a habitable volume of . Skylab was damaged during the ascent to orbit, losing one of its solar panels and a meteoroid thermal shield. Subsequent crewed missions repaired the station, and the final mission's crew, Skylab 4, set a human endurance record with 84 days in orbit when the mission ended on February 8, 1974. Skylab stayed in orbit another five years before reentering the Earth's atmosphere over the Indian Ocean and Western Australia on July 11, 1979.

Apollo–Soyuz Test Project

thumb|left|alt= the five crew members of ASTP sitting around a miniature model of their spacecraft|Apollo-Soyuz crew: From left to right: Donald "Deke" Slayton, Thomas Patten Stafford, Vance Brand, Alexei Leonov, and Valeri Kubasov
In May 1972, President Richard M. Nixon and Soviet Premier Leonid Brezhnev negotiated an easing of relations known as detente, creating a temporary "thaw" in the Cold War. The time seemed right for cooperation rather than competition, and the notion of a continuing "race" began to subside.

The two nations planned a joint mission to dock the last US Apollo craft with a Soyuz, known as the Apollo-Soyuz Test Project (ASTP). To prepare, the US designed a docking module for the Apollo that was compatible with the Soviet docking system, which allowed any of their craft to dock with any other (e.g. Soyuz/Soyuz as well as Soyuz/Salyut). The module was also necessary as an airlock to allow the men to visit each other's craft, which had incompatible cabin atmospheres. The USSR used the Soyuz 16 mission in December 1974 to prepare for ASTP.

The joint mission began when Soyuz 19 was first launched on July 15, 1975, at 12:20 UTC, and the Apollo craft was launched with the docking module six and a half hours later. The two craft rendezvoused and docked on July 17 at 16:19 UTC. The three astronauts conducted joint experiments with the two cosmonauts, and the crew shook hands, exchanged gifts, and visited each other's craft.

Legacy

Human spaceflight after Apollo
thumb|International Space Station in 2010
In the 1970s, the United States began developing the reusable orbital Space Shuttle spaceplane, and launched a range of uncrewed probes. The USSR continued to develop space station technology with the Salyut program and Mir ('Peace' or 'World', depending on the context) space station, supported by Soyuz spacecraft. They developed their own large spaceplane under the Buran program. The USSR dissolved in 1991 and the remains of its space program mainly passed to Russia. The United States and Russia have worked together in space with the Shuttle–Mir Program, and again with the International Space Station.

The Russian R-7 rocket family, which launched the first Sputnik at the beginning of the Space Race, is still in use today. It services the International Space Station (ISS) as the launcher for both the Soyuz and Progress spacecraft. It also ferries both Russian and American crews to and from the station.

Currently, the US Commercial Crew Development and Artemis program are intended to result in the development of a variety of crewed spacecraft. Russia is also developing a Soyuz replacement, and China has sent crewed Shenzhou spacecraft to orbit.

Political legacy
The imagery of the Space Race has remained poignant in the popular imagination of many nations even after the fall of the Soviet Union. In August 2020 Russia announced that they were releasing a vaccine for COVID-19 skipping multiple stages of clinical trials, referring to it as the "Sputnik vaccine" to capture the sense of pride still felt by Russians from their victories in the Space Race. https://www.washingtonpost.com/world/russia-unveils-coronavirus-vaccine-claiming-victory-in-global-race-before-final-testing-is-complete/2020/08/11/792f8a54-d813-11ea-a788-2ce86ce81129_story.html

See also

 Billionaire space race
 Cold War playground equipment
 Comparison of Asian national space programs – a so-called "Asian space race"
 History of spaceflight
 List of space exploration milestones, 1957–1969
 Moon Landing
 Moon Shot
 Space advocacy
 Space exploration
 Space policy
 Space propaganda
 Spaceflight records
 SEDS
 Timeline of Solar System exploration
 Timeline of space exploration
 Timeline of the Space Race
 Woods Hole Conference
 Mars race

Notes

References
 
 
 
 
 
 
 
 
 David, Leonard. Moon Rush (Simon and Schuster, 2019).
 
 
 
 
 
 
 
 
 
 
 
 Pekkanen, Saadia M. "Governing the New Space Race." AJIL Unbound 113 (2019): 92–97. online, role of international law.
 
 
 
 
 
 
 
 
 
 
   (Anton Pervushin. 108 minutes which changed the world; in Russian)

External links

 Scanned letter from Wernher Von Braun to Vice President Johnson
 "America's Space Program: Exploring a New Frontier", a National Park Service Teaching with Historic Places (TwHP) lesson plan
 Why Did the USSR Lose the Moon Race? from Pravda, 2002-12-03
 Space Race Exhibition at the Smithsonian National Air and Space Museum
 TheSpaceRace.com – Mercury, Gemini, and Apollo space programs
 Timeline of the Space Race to the Moon 1960 – 1969
 Shadows of the Soviet Space Age, Paul Lucas
 Chronology:Moon Race at russianspaceweb.com
 

Category:Cold War
Category:History of science and technology in the United States
Category:Science and technology in the Soviet Union
Category:Soviet Union–United States relations
Category:Presidency of John F. Kennedy
Category:Space policy
Category:Presidency of Lyndon B. Johnson
Category:Presidency of Dwight D. Eisenhower
Category:Presidency of Richard Nixon
Category:Presidency of Gerald Ford
Category:Geopolitical rivalry
Category:Technological races
Category:Operation Paperclip
Category:Space exploration
Category:Spaceflight histories