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First Earth Orbiter
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First Lunar Impact
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First images of far side moon
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First manned Earth orbiter
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First successful Venus flyby and first successful planetary encounter
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First Mars flyby
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First lunar lander
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First lunar orbiter
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First Venus atmospheric probe
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First lunar flyby and return to Earth
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First manned lunar orbiter
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First manned lunar Landing
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First Venus lander
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First robotic lunar sample return
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First lunar rover
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first Mars impact
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first Mars lander (short-lived) and first Mars atmospheric probe
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First Mars orbiter
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First Jupiter flyby
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first Saturn flyby