• Mercury is the smallest planet with no moon.
  • It is also the planet closest to the Sun.
  • The surface of Mercury is covered with craters, like Earth’s Moon.
  • Mercury is extremely hot and has a liquid metal core.
  • Scientists think that there may be a small amount of water, in the form of ice, at the planet's poles.
  • Mercury has a very short year, but it also has very long days.
  • It rotates slowly on its axis, turning exactly three times for every two times it orbits the sun.
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