[astrogeology] A dramatic view of Phobos, one of the Mars' moons, and its largest crater Sticky, acquired by HiRES in March 2008. Fun fact: Phobos is closer to its planet than any other known moon, so close in fact that it orbits Mars faster than it rotates! Phobos' orbit lowers by one meter every century. Eventually it will collide with its planet or break up into a planetary ring. ~Al. A.