which is the coldest planet?, Uranus, Neptune, earth , Mardi, which planets atmosphere is rich in nitrogen and oxygen?, Saturn, Uranus, earth , Venus, which planets have similarities with EArth?, Mars, Mercury, Uranus, Pluto, how many planets are there in our solar system?system, five, four, eight, nine, who is the larger than Earth's moon?, Mercury, Venus, Saturn, Mars.

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