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"It has a cool, solid surface with an atmosphere of nitrogen and oxygen and clouds of water vapor." Which of the planets fits this description?
Q3: According to current theories of planetary formation,
Q50: The ring system around Uranus was originally
Q56: Approximately how thick (top to bottom) are
Q57: What kind of ring or rings does
Q59: Astronomers have searched for extrasolar planets for
Q87: The spacecraft that photographed Neptune on a
Q145: Most of the information astronomers have about
Q178: The Martian moon Phobos orbits near the
Q216: Which of these properties of Earth and
Q324: The water in the ocean predicted to