under the influence of the Sun but with some dramatic differences. Pioneer 10 was launched in March 1972, and within 10 hours passed by the Moon; over the next 35 years or so the mission would be the first out, laying out many firsts of discoveries about the nature of heliosphere as well as Jupiter's impact on it. Pioneer 10 was the first spacecraft to detect sodium and aluminum ions in the solar wind, as well as helium in the inner Solar System. In November 1972, Pioneer 10 encountered Jupiter's enormous (compared to Earth) magnetosphere and would pass in and out of it and its heliosphere 17 times charting its interaction with the solar wind. Pioneer 10 returned scientific data until March 1997, including data on the solar wind out to about 67 AU. It was also contacted in 2003 when it was a distance of 7.6 billion miles from Earth (82 AU), but no instrument data about the solar wind was returned then. Voyager 1 surpassed the radial distance from the Sun of Pioneer 10 at 69.4 AU on 17 February 1998, because it was traveling faster, gaining about 1.02 AU per year. In 2023, Voyager 2 will overtake Pioneer 10 as the second most distant human-made object from the Sun. Pioneer 11, launched a year after Pioneer 10, took similar data as Pioneer out to 44.7 AU in 1995 when that mission was concluded. Pioneer 11 had a similar instrument suite as 10 but also had a flux-gate magnetometer. Pioneer and Voyager spacecraft were on different trajectories and thus recorded data on the heliosphere in different overall directions away from the Sun. Data obtained from Pioneer and Voyager spacecraft helped corroborate the detection of a hydrogen wall. Voyagers 1 and 2 were launched in 1977 and operated continuously to at least the late 2010s, and encountered various aspects of the heliosphere past Pluto. In 2012 Voyager 1 is thought to have passed through heliopause, and Voyager 2 did the same in 2018 The twin Voyagers are the only man-made objects to have entered interstellar space. However, while they have left the heliosphere, they have not yet left the boundary of the Solar System which is considered to be the outer edge of the Oort Cloud. Upon passing the heliopause, Voyager 2 Plasma Science Experiment (PLS) observed a sharp decline in the speed of solar wind particles on 5