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Surface of Mars
By Reuters -
A view of Ophir Chasma on the northern portion of the vast Mars canyon system, Vallles Marineris, taken by NASA's Mars Reconnaissance Orbiter in August 2015. REUTERS/NASA 
The base of Mars' Mount Sharp is pictured in August 2012. 
Nili Patera, one of the most active dune fields on the planet Mars is shown in March 2014. 
Rough spherical features in an area called Yellowknife Bay. These features are interpreted as concretions, implying they formed in water that percolated through pores in the sediment. Spherical concretions have previously been discovered in other rocks on Mars. 
Curiosity appears as a bluish dot near the lower right corner of this enhanced-color view from Orbiter taken on June 27, 2013. 
The surface of the planet Mars inside Gale Crater. 
A rock outcrop called Link pops out from a Martian surface. Rounded gravel fragments, or clasts, up to a couple inches in size are in a matrix of white material. The outcrop characteristics are consistent with a sedimentary conglomerate, or a rock that was formed by the deposition of water and is composed of many smaller rounded rocks cemented together. Scientists enhanced the color in this version to show the Martian scene as it would appear under the lighting conditions we have on Earth. 
Portions of the Martian surface showing many channels from 1 meter to 10 meters wide on a scarp in the Hellas impact basin. 
Part of the wall of Gale Crater. Here, a network of valleys believed to have formed by water erosion enters Gale Crater from the outside. 
The northern-most sand dunes are seen as they begin to emerge from their winter cover of seasonal carbon dioxide (dry) ice in this image acquired on January 16, 2014. 
A location on Mars associated with the best-selling novel and Hollywood movie, "The Martian" This area is in the Acidalia Planitia region and in the novel and the movie, it is the landing site of a crewed mission named Ares 3. REUTERS/NASA/JPL-Caltech/Univ. of Arizona 
An impact crater on Mars is seen in an image taken by Orbiter on November 19, 2013. 
A view of the Noctis Labyrinthus region of Mars, perched high on the Tharsis rise in the upper reaches of the Valles Marineris canyon system. 
Inclined layering known as cross-bedding in an outcrop called Shaler on a scale of a few tenths of a meter in an image taken January 2013. 
A cliff, up to 4,000 m high, located in the eastern part of Echus Chasma. 
Two trenches dug by Phoenix's Robotic Arm in June 2008. 
Mars' Victoria Crater at Meridiani Planum. 
An iron meteorite on Mars in an image taken by the Mars Exploration Rover Opportunity in January 2005. REUTERS/NASA/JPL/Cornell 
Echus Chasma is an approximately 100 km long and 10 km wide incision in the Lunae Planum high plateau north of Valles Marineris, the Grand Canyon of Mars. Images taken by ESA's Mars Express of Echus Chasma in July 2008. 
This image, cropped from a larger panoramic image mosaic taken by the Mars Exploration Rover Spirit panoramic camera, released in March 2004, shows the rover's destination toward the hills nicknamed the Columbia Hills. REUTERS/NASA/JPLCornell/USGS 
A portion of the west rim of Endeavour crater sweeps southward in this color view from NASA's Mars Exploration Rover Opportunity released in August 2011. 
A high-resolution image, using data from the NASA Mars Exploration Rover Opportunity's panoramic camera's near-infrared, blue and green filters combined to create an approximate true-color image, of a puzzling rock outcropping to the northwest of the rover. Image taken January 2004. REUTERS/HO/NASA/JPL/Cornell