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A planet is a large object that orbits a star
Grades 7-12+ (Ages 12+)
Encyclopedic entry. We live at the bottom of an invisible ocean called the atmosphere, a layer of gases surrounding our planet. Nitrogen and oxygen account for 99 percent of the gases in dry air, with argon, carbon dioxide, helium, neon, and other gases making up minute portions.
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Photograph courtesy NASA
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