True planets, dwarf planets, and exoplanets-what's the difference? Find out the three rules scientists use to decide what makes a planet. Discover how they continue to search outside our solar system for a planet like Earth.
True planets, dwarf planets, and exoplanets-what's the difference? Find out the three rules scientists use to decide what makes a planet. Discover how they continue to search outside our solar system for a planet like Earth.
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