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The first artificial satellite sent in space.
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Alan B. Shepard became the first U.S. citizen in space.
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Yuri A. Gagarin became the first human sent in space.
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Astronaut John Glenn became the first U.S. citizen to orbit the Earth.
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Apollo 11 landed on the Moon's surface, and Neil Armstrong was the first human to set foot on the Moon.
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Space probes Voyager 1 and Voyager 2 were launched in 1977 and are now headed into deep space. Voyager 1 flew past Jupiter and Saturn, and Voyager 2 flew past Jupiter, Saturn, Venus and Neptune.
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Galileo was launched in 1989, and reached Jupiter in 1995. In July 1995 Galileo released a smaller probe that began a five month approach to Jupiter, and took a parachute ride through Jupiter's violent atmosphere in December 1995.