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June 21, 2008
Pebbles in space
Only one of these is currently in orbit round Mars:
The first picture is Phobos, one of the two moons of Mars, it's about 21 km across in this picture. The second is, somewhat pleasingly, 21 mm across.
photo: NASA/JPL/University of Arizona
Posted by john at June 21, 2008 12:27 AM