The Martian moon Phobos seen from 5800 km by the Mars Reconaissance Orbiter on March 23. Stickney Crater on the right is the largest featore on the surface. The crater is 9 km wide on a moon only 22 km across. Some have suggested these moons as stopping-off points for Mars. Scientists still are not sure how the Martian moons formed or how they survived impacts like Stickney, but they are certainly pretty.