Astronomy Picture of the Day . Red Mars from Spirit . ... Rocks are strewn across the broad, flat Gusev crater floor in this sharp color picture from NASA's Spirit rover. Recorded by the rover's panoramic camera, the picture is part of Spirit's first color image of Mars - the highest resolution picture yet taken on the surface of another planet. ... Deimos: A Small Martian Moon . ... Mars has two tiny moons, Phobos and Deimos. Pictured above is Deimos, the smaller moon of Mars. ...