Martian Moons Pair Up

In a first, ESA's Mars Express orbiter imaged the Martian moons Phobos and Deimos together on Nov. 5, 2009. Phobos, the larger of the two moons, orbits closer to Mars, circling the planet every 7 hours and 39 minutes.
credit : ESA/DLR/FU Berlin (G. Neukum)