The Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) aboard NASA's Mars Reconnaissance Orbiter obtained this spectrum for comet C/2013 A1 Siding Spring during the comet's close approach to Mars.
Sulfates are found overlying clay minerals in sediments within Columbus Crater, a depression that likely hosted a lake in the past in this image based on information from NASA's Mars Reconnaissance Orbiter.
On ancient Mars, water carved channels and transported sediments to form fans and deltas within lake basins. Spectral data acquired by NASA's Mars Reconnaissance Orbiter, indicate chemical alteration by water.
The colorful rocks exposed in the central peak visible in this image from NASA's Mars Reconnaissance Orbiter probably reflect variations in mineral content that were caused by water activity early in Mars' history.
Fractures in Carbonate-Bearing Rocks at Mars' Huygens Basin
This false-color image NASA's Mars Reconnaissance Orbiter shows that fractures and possible layers are visible in the light-toned rock exposure containing the carbonates. The location is inside an unnamed crater on the uplifted rim of Huygens crater.
This map indicates some of the geological information gained from orbital observations of Endeavour Crater, which has been the long-term destination for NASA's Mars Exploration Rover Opportunity since mid-2008.
This false color image from NASA's Mars Reconnaissance Orbiter indicates that the volcanic cone in the Nili Patera caldera on Mars has hydrothermal mineral deposits on the southern flanks and nearby terrains.
Perspective View of Layered Mound in Gale Crater, Mars
This oblique view, captured by NASA's Mars Reconnaissance Orbiter, shows geological layers of rock exposed on a mound inside Gale Crater on Mars. This view was created from a three-dimensional topographic model of the mound.
Context of Carbonate Rocks in Heavily Eroded Martian Terrain
The color coding on this CRISM composite image of an area on Mars is based on infrared spectral information interpreted as evidence of various minerals present. Carbonate, which is indicative of a wet and non-acidic history, occurs in very small patches.