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Enhanced-color composite of the Caloris Basin, Mercury

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Mercury in retrograde
© NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
Today we're traveling to outer space to catch a glimpse of the Caloris Basin on the planet Mercury. This small planet—about the size of Earth's moon—is riddled with craters, but none as spectacular as the Caloris Basin. One of the largest impact craters in the solar system, Caloris is about 950 miles across and ringed by mile-high mountains.
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Quick fact:
Mercury is the closest planet to the sun. It also orbits the sun faster than any other planet, taking only 88 days to make a complete loop.
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