Planet V
Sign in to savescientific proposal in 2002 for a destroyed fifth planet
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Solar System
Entity
Kuiper Belt
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nebular hypothesis
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planet beyond Neptune
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Mars-crossing asteroid
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list of Earth-crossing asteroids
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list of hypothetical Solar System objects
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Earth
Concept
Sun
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Moon
Concept
astronomy
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Mars
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Venus
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Mercury
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planet
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Jupiter
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Saturn
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Uranus
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Neptune
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universe
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