sub-Earth
Sign in to savethumb|300px|Comparing the size of Earth, [[Mars, and exoplanets of Kepler-20 and Kepler-42]]
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thumb|300px|Comparing the size of Earth, [[Mars, and exoplanets of Kepler-20 and Kepler-42]]
A sub-Earth is a planet "substantially less massive" than Earth and Venus. In the Solar System, this category includes Mercury and Mars.
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list of planet types
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outer space
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cosmic dust
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astronomical transit
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hot Jupiter
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planetary habitability
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hot Neptune
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Caloris Planitia
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list of extrasolar planet extremes
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list of extrasolar planets
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Earth
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Mars
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Solar System
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Venus
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Mercury
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Pluto
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asteroid
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dwarf planet
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magnetic field
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