Mercury is the closest planet to the sun. It has no atmosphere and is, as such, covered in craters. It's also incredibly hot but, surprisingly, has water ice hiding beneath its surface.
Mar is the fourth planet from the sun and the outermost of the terrestrial planets.
Venus is a gorgeous naked-eye planet, hanging like a diamond in the twilight.
Take a look up to the moon's surface features, core, and theories about its formation.
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