Random Phobos Fact

Phobos appears that it may be a rubble pile that is held together by a thin crust. There are long grooves on the surface that some believe to be early signs of the moon breaking apart due to tidal stresses caused by Mars' gravity. Others believe that the grooves could be remnants of the impact that caused the crater Stickney and that the grooves suggest loose material slid down inside the crater walls over time. (Space > Phobos )



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