Thursday, March 31, 2011
APOD 4.1
This is a picture of Mars. The huge canyon in the center is Valles Marineris. It is 3,000 kilometers long, and up to 600 kilometers wide. It gets up to 8 kilometers deep. We're not sure what caused the canyon to form, but some people think that it formed from a huge crack in the planet's cooling surface.
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