NASA: Stretch Marks Suggest Doom For Mars Moon

Mars' largest moon has begun to fall apart, according to NASA. Scientists first thought the 100-200 metre wide grooves streaking some 12 miles (20km) along Phobos' oddly shaped surface were fractures caused by an impact that nearly shattered the satellite and formed its Stickney crater. But further analysis reveals they are likely to be "stretch marks" formed by stresses caused by the gravitational pull from Mars.