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It was the first artificial satellite to be put into Earth's orbit. It was launched into Earth's orbit by the Soviet Union on October 4, 1957. The announcement of Sputnik 1's success started the Space Race.
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The first satellite photographs of Earth were made on August 14, 1959 by the U.S. Explorer 6.
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Luna 2 was the first spacecraft to reach the surface of the Moon. It was sent by the USSR.
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The probe Luna 3 was an early feat in space exploration of outer space.
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Vostok 1 was the first human spaceflight in history. The Vostok 1 was launched on April 12, 1961. The flight took Yuri Gagarin, from the Soviet Union, into space.
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Apollo 8 was the second manned mission of the American Apollo space program. It took three days for it to orbit the moon and return to Earth.
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Apollo 11 was the spaceflight which landed the first humans on the moon. The two men that landed ln the moon was Neil Armstrong and Edwin "Buzz" Aldrin, Jr. They landed on July 20, 1969, at 20:17:39 UTC. The mission is considered a major accomplishment in the history of exploration.
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Salyut 1 was the first space station of any kind, launched by the USSR on April 19, 1971. It was launched unmanned using a Proton-K rocket.
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Mariner 9 is a NASA space orbiter that helped in the exploration of Mars and was part of the Mariner program. It took a total of 7329 photos by the time it returned to Earth.