The surface of Mars
A field of barchan sand dunes appear turquoise blue on the surface of Mars in this enhanced image taken by themore
The base of Mars' Mount Sharp in an image taken by the Curiosity rover. REUTERS/NASA
Dunes on Mars are almost free of their seasonal ice cover during early Martian summer, with pockets of ice stimore
The surface of Mars after a meteoroid hit and exploded, creating an impact crater 5 meters across that triggermore
A view of the Ophir Chasma on the northern portion of the vast Mars canyon system, Vallles Marineris, taken bymore
Nili Patera, one of the most active dune fields on the planet Mars. Image taken by NASA's Mars Reconnaissance more
Rough spherical features in an area called Yellowknife Bay. These features are interpreted as concretions, impmore
An impact crater on Mars is seen in an image taken by NASA's Mars Reconnaissance Orbiter. REUTERS/NASmore
A rock outcrop called Link pops out from a Martian surface. Rounded gravel fragments, or clasts, up to a couplmore
The northern-most sand dunes are seen as they begin to emerge from their winter cover of seasonal carbon dioximore
A location on Mars associated with the best-selling novel and Hollywood movie, "The Martian" This area is in tmore
Portions of the Martian surface showing many channels from 1 meter to 10 meters wide on a scarp in the Hellas more
A view of the Noctis Labyrinthus region of Mars, perched high on the Tharsis rise in the upper reaches of the more
The surface of the planet Mars inside Gale Crater seen from Curiosity. REUTERS/NASA
Curiosity appears as a bluish dot near the lower right corner of this enhanced-color view from Orbiter. REUTmore
Part of the wall of Gale Crater. Here, a network of valleys believed to have formed by water erosion enters Gamore
Inclined layering known as cross-bedding in an outcrop called Shaler on a scale of a few tenths of a meter. more
Two trenches dug by Phoenix's Robotic Arm. REUTERS/NASA/JPL-Caltech/University of Arizona
Mars' Victoria Crater at Meridiani Planum. REUTERS/NASA/JPL/Caltech
An iron meteorite on Mars in an image taken by the Mars Exploration Rover Opportunity. REUTERS/NASA/JPL/Cornmore
This image, cropped from a larger panoramic image mosaic taken by the Mars Exploration Rover Spirit panoramic more
Images from our home in space as the ISS celebrates 20 years of occupancy.
A selection of some of our top sports photography of the past week.
Images of the world's largest coral reef system from above.
A U.S.-bound caravan of thousands of mostly Honduran migrants is in Mexico and inching north, even as Trump orders 7,000 troops to the border and has...