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Explorer 1 (US) - first american satellite, unmanned
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Sputnik 3 (USSR) - first data about Earth taken from orbit
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Vostok 1 (USSR) - first manned space flight, Yuri Gagarin. One orbit of Earth (first person in space)
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Mercury Freedom 7 (US) - Alan Shepard, first American in space
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Gemini 4 (US) - first American. Space walk (21 minutes)
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Venera 3 (USSR) - impacted venus on March 1, 1966: no data
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Luna 9 (USSR ) - first soft landing on moon, returned surface photos of the moon
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Surveyor 1 (US) - first america soft landing on moon, returned 11,240 photos
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Apollo 5 (US) - first flight of lunar module (unmanned)
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Zond 5 (USSR) - first satellite to fly around the moon and return to earth
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Apollo 13 (US) - third manned landing attempt aborted due to oxygen tank explosion in service module.
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Soyuz 9 (USSR) - set new duration record for manned space flight.
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Salyut 1 (USSR) - first orbiting space station lab.
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Mars 2 (US) - first vehicle to land on Mars
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Pioneer 10 (US) - first successful flyby of Jupiter
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Venera 8 (USSR) - landed on Venus and lasted long enough to transmit surface date.