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A photo of the planet Mercury from space. It is gray and has many craters.
NASA/Johns Hopkins University Applied Physics Laboratory/Arizona State University/Carnegie Institution of Washington, NASA JPL Photojournal / Public Domain
photograph of Mercury
Mercury is a rocky planet. It is the smallest planet in the solar system. It is close to the Sun, so it gets very hot.
This diagram shows the Sun and planets in the solar system. Select Mercury.
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