An image of the larger of Mars' two moons, Phobos, orbiting in front of Mars by the High-Resolution Stereo Camera on board ESA's Mars Express spacecraft on January 22, 2007. #esa

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Comet Lovejoy is visible near Earth's horizon in this nighttime image photographed by NASA astronaut Dan Burbank, Expedition 30 commander, onboard the International Space Station on Dec. 22, 2011. #nasa