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First artificial satellite launched in space
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First U.S. citizen in space
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Yuri A. Gagarin, soviet cosmonaut, first human in space
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Verifie high tempuratures in Venus's atmosphere
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First step in U.S. sending a man to the moon
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First U.S. citizen to orbit Earth
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Second step in U.S. to reach the moon
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Survayed the surface of the moon
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Final step in U.S. bringing man to moon
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sent back photos of Jupiter-first probe to encounter an outer planet
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Another space probe that reaches the outer edges of the solar system
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Orbiter mapped the surface of Mars; lander searched for life on Mars
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Soviet probe to study the surface of Venus
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Mapped Venus's surface and returned data on the composition of Venus's atmosphere
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It studied the outer planets
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sent back pictures of Europa and Io, two of Jupiters 61 moons