have far-reaching effects on unprotected electronics. The 1962 Starfish Prime test produced an HEMP which caused electronics to fail 1400 km (800) away in Hawaii where about 300 streetlights immediately failed. Soviet tests with HEMPs were executed above land, where a 1000 km power line was shut down, and all telephone lines within 500 km were damaged. HEMPs cause banana-shaped areas of effect, due to the pulse’s interaction with the Earth’s magnetic field. A nuclear weapon detonated at 400 km creates an EMP 2,200 km in radius, large enough to cover the continental United States. However, any nuclear device detonated above 30 km will create an EMP of at least 600 km in radius. Space warfare Space warfare is combat that takes place in outer space, i.e. outside the atmosphere. Technically, it refers to battles where the targets themselves are in space. Space warfare therefore includes ground-to-space warfare, such as attacking satellites from the Earth, as well as space-to-space warfare, such as satellites attacking satellites. It does not include the use of satellites for espionage, surveillance, or military communications, however useful those activities might be. It does not technically include space-to-ground warfare, where orbital objects attack ground, sea or air targets directly, but the public and media frequently use the term to include any conflict which includes space as a theatre of operations, regardless of the intended target. For example, a rapid delivery system in which troops are deployed from orbit might be described as "space warfare," even though the military uses the term as described above. A film was produced by the U.S. Military in the early 1960s called Space and National Security which depicted space warfare. From 1985 to 2002 there was a United States Space Command, which in 2002 merged with the United States Strategic Command. There is a Russian Space Force, which was established on August 10, 1992, and which became an independent section of the Russian military on December 1, 2001. Only a few incidents of space warfare have occurred in world history, and all were training missions, as opposed to actions against real opposing forces. In the mid-1980s a USAF pilot in an F-15 successfully shot down the P78-1, a communications satellite in a orbit. In 2007, the People's Republic of China used a missile system to destroy one of its obsolete satellites (see 2007 Chinese anti-satellite missile test), in 2008 the United States