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ROVER MARS .. NASA's Mars Rover Opportunity catches its own late-afternoon shadow in this dramatically lit view eastward across Endeavour Crater on Mars

Mars' Victoria Crater at Meridiani Planum taken by NASA's High Resolution Imaging Science Experiment (HiRISE) camera.

Stickney Crater, the largest crater on the Martian moon Phobos, is named for Chloe Angeline Stickney Hall, mathematician and wife of astronomer Asaph Hall, who discovered both of Mars's moons in 1877. Over 9 km across, Stickney is nearly half the diameter of Phobos itself, so large that the impact that blasted out the crater likely came close to shattering the tiny moon. This enhanced-color image of Stickney and surroundings was taken by the HiRISE camera on the Mars Reconnaissance Orbiter.

NASA found evidence that briny water flows on Mars, raising chances that life could exist on the Red Planet. (Old news but cool view.)

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Cosmic clouds of gas and dust drift across this magnificent panorama, spanning some 17 degrees near the southern boundary of the heroic constellation Perseus.