answers: 31 January 1958
context: Landsat 1 Landsat 1, originally named "Earth Resources Technology Satellite 1", was the first satellite of the United States' Landsat program. It was a modified version of the Nimbus 4 meteorological satellite and was launched on July 23, 1972 by a Delta 900 rocket from Vandenberg Air Force Base in California. The near-polar orbiting spacecraft served as a stabilized, Earth-oriented platform for obtaining information on agricultural and forestry resources, geology and mineral resources, hydrology and water resources, geography, cartography, environmental pollution, oceanography and marine resources, and meteorological phenomena. The multi-agency Earth Resources Satellites Program was begun in 1966 by the </s> by American propaganda, of the United States as the technological superpower and the Soviet Union as a backward country. Privately, however, the CIA and President Eisenhower were aware of progress being made by the Soviets on "Sputnik" from secret spy plane imagery. Together with the Jet Propulsion Laboratory (JPL), the Army Ballistic Missile Agency built "Explorer 1", and launched it on 31 January 1958. Before work was completed, however, the Soviet Union launched a second satellite, "Sputnik 2", on 3 November 1957. Meanwhile, the televised failure of "Vanguard TV3" on 6 December 1957 deepened American dismay over the country's position </s> Satellite In the context of spaceflight, a satellite is an artificial object which has been intentionally placed into orbit. Such objects are sometimes called artificial satellites to distinguish them from natural satellites such as Earth's Moon. In 1957 the Soviet Union launched the world's first artificial satellite, Sputnik 1. Since then, about 8,100 satellites from more than 40 countries have been launched. According to a 2018 estimate, some 4,900 remain in orbit, of those about 1,900 were operational; while the rest have lived out their useful lives and become space debris. Approximately 500 operational satellites are in low-Earth orbit, 50
question: when did the us send its first satellite into space