Weird Grooves On Mars’ Moon Phobos Traced to Asteroids

Crisscrossed grooves and chains of small craters cover the Martian moon Phobos. NASA’s Viking orbiters first photographed the grooves on Phobos in the 1970s.

From NASA’s Mars Global Surveyor and the European Space Agency’s Mars Express revealed another set of grooves on Phobos that didn’t fit the profile for tide-induced marks.

Read More : http://www.space.com/33895-phobos-grooves-mars-mystery-solved.html

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