Universe Today
"We think this makes a pretty strong case that it was this rolling boulder model accounts for most if not all the grooves on Phobos." Kenneth Ramsley, Brown University.
Strange Grooves on Phobos Were Caused by Boulders Rolling Around on its Surface
"We think this makes a pretty strong case that it was this rolling boulder model accounts for most if not all the grooves on Phobos." Kenneth Ramsley, Brown University.