Orbiting a mere 6,000 kms above the surface of Mars, Phobos is closer to its planet than any other moon in the solar system.
The long, shallow grooves lining the surface of Phobos are possibly early signs of the structural failure that will ultimately destroy this moon of Mars.
"We think Phobos has already started to fail, and the first sign of this failure is the production of these grooves," said Terry Hurford from NASA's Goddard Space Flight Center in Greenbelt, Maryland, in a statement.
Orbiting a mere 6,000 km above the surface of Mars, Phobos is closer to its planet than any other moon in the solar system. Mars' gravity is drawing in Phobos, the larger of its two moons, by about 2 metres every hundred year
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