Curious Doughnut in Martian Sky | Space Wallpaper

This space wallpaper shows part of a set of three images revealing views three seconds apart as the larger of Mars' two moons, Phobos, passed directly in front of the sun as seen by NASA's Mars rover Curiosity.



via LiveScience.com http://www.livescience.com/42277-annular-eclipse-of-sun-by-phobos-curiosity-space-wallpaper.html