(click photo to enlarge)
You will never guess (and I mean that—my guess was that it was a detail of some ancient tapestry) so I will tell you: It is a photograph of the surface of Mars, taken by a satellite 178 miles above the surface. The photo covers an area about half a kilometer (.3 miles) across. It has not been altered. Read more at the Top Ten Astronomy Photos of 2009.
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