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Was the first artificial satellite in space.
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Became the first U.S. citizen in space
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Was the first U.S. citizen to orbit Earth
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Mariner 2 verified high temperatures in Venus's atmospheres.
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Landed gently on the Moon's surface, indicating that the Moon's surface xould support spacecraft and humans.
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First human to set foot on the Moon.
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Pioneer 10 sent back photos of Jupiter and it was the first probe to encounter an outer planet.
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Mariner 10 obtained the first good images of the surface of Mercury.
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Viking 1 orbiter mapped the surface of mars; lander searched for life on Mars.
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Voyager 1 flew past Jupiter and Saturn, Voyager 2 flew past Jupiter, Saturn, Uranus, and Neptune. These probes will explore beyond the solar system as part of the Voyager Interstellar Mission,
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Galileo reached Jupiter in 1995. Then in July 1995 it released a smaller probe.
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Magellan mapped Venus's surface and returned data on the composition of Venus's atmosphere.