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On Aug. 20, 2013, Curiosity Rover looked up from the Martian surface and saw the larger of the two moons of Mars, Phobos, passing directly in front of the sun.  This is a good time to reflect on the strange fact that our moon and our sun as seen from the earth surface have almost the same size, by pure chance. 
Also note how Phobos is much lumpier-looking than our moon.  Phobos is 14-mile wide and its orbit is only 3,700 miles up. Our moon is orbiting at 239,000 miles.

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