Random thoughts from an Internet island...
That's what I immediately thought of when I saw this photo. They're actually wind-blown sand dunes. This is one of seven great photos from the NASA probe Mars Odyssey.
via apod.nasa.gov The Moon passed in front of the Red Planet, and here you see it as a speck of light on the sunlit side just as it becomes visible again.
via antwrp.gsfc.nasa.gov A thunderstorm over Montana.
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