Mercury the most inner planet closest to the Sun. The small cratered planet orbits around the Sun in only 88 days. Mercury has almost no atomsphere and is extremely hot. Mercury the tiny planet is a third of the size of Earth. It has a heavy core of dense metal. This makes up nearly three-quarters of its inside. Like mentioned this tiny world is extremely cratured and billions of years ago many rocks crashed into it. The enormus crater that crashed into the planet is called the Caloris Basin. The crater is more than 1,250 km across. (800 miles)
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