Space Explooration By kallen2016 Period: Oct 4, 1957 to Oct 6, 2011 Space Exploration Oct 6, 1957 Sputnik 1 The former Soviet Union used a rocket to send it into space. It was the first artificial satellite. It orbited earth 57 days before gravity pulled it back to earth. May 5, 1961 Alan B. Shepard He became the first U.S citizen in space. Oct 6, 1961 Yuri A. Gagarin He was a Soviet cosmonaut, first one in space. He orbited Earth and returned safely. Aug 1, 1962 Mariner 2 It explored Venus's atmosphere Oct 6, 1962 John Glenn He became the first U.S citizen in project Mercury to orbit Earth. Jul 20, 1969 Project Apollo, Apollo 11 Final stage of the program to reach the moon. Apollo 11 landed on the moon. Jul 20, 1969 Neil Armstrong He was the first human to set foot on the moon along with Edwin Aldrin and Michael Collins. Mar 6, 1972 Pioneer 10 sent back photos of Jupiter, it was the first space probe to encounter an outer planet Aug 6, 1975 Viking 1 It was an orbiter that mapped the surface of Mars; lander searched life on Mars May 6, 1989 Magellan Mapped Venus's surfaced and returned data on the composistion of Venus's atmosphere. Oct 6, 1999 Terra Satellite took false-colored images of spring growth, sea suface temperature, carbon monoxied concentrations, and reflected sunlight among others.