Mars' seasonal cap of carbon dioxide ice has eroded many beautiful terrains as it sublimates (goes directly from ice to vapor) every spring. In the region where the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter took this image, we see troughs that form a starburst pattern. In other areas these radial troughs have been refered to as spiders, simply because of their shape. In this region the pattern looks more dendritic as channels branch out numerous times as they get further from the center.
March 25, 2009
The largest crater in this mosaic of images taken by the Context Camera on NASA's Mars Reconnaissance Orbiter is Endeavour Crater, which is 22 kilometers (14 miles) in diameter.
March 18, 2009
These color-enhanced views of Deimos, the smaller of the two moons of Mars, were taken by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter.
March 9, 2009
This image from the High Resolution Imaging Science Experiment (HiRISE) on NASA's Mars Reconnaissance Orbiter shows an exposure of layered rock that exhibits a type of fracturing -- called columnar jointing -- that results when cooling lava contracts.
February 25, 2009
The image shows a very tall, wide, dish-shaped device that is about three times as wide and as tall as the two-story dome that supports it. Four metal ladderlike extensions form a pyramidal structure topped by a box-like frame used for transmission and reception. The entire array is pointed skyward. In the background is a partly cloudy, blue sky above sagebrush-covered desert hills.
February 16, 2009
This image shows part of the floor of an impact crater on the northern rim of the giant Hellas Basin.
January 18, 2009
This fresh crater is located in the northern mid-latitudes. It is designated as fresh because of its very sharp rim.
December 23, 2008
This image from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter shows sedimentary-rock layering in which a series of layers are all approximately the same thickness.
December 4, 2008
Artist concept of glacier on Mars.
November 20, 2008
NASA's Mars Reconnaissance Orbiter has revealed Martian rocks containing a hydrated mineral similar to opal.
November 6, 2008
NASA's Mars Reconnaissance Orbiter has revealed Martian rocks containing a hydrated mineral similar to opal. The rocks are light-toned and appear cream-colored in this false-color image taken by the High Resolution Imaging Science Experiment camera. Images acquired by the orbiter reveal that different layers of rock have different properties and chemistry. The opal minerals are located in distinct beds of rock outside of the large Valles Marineris canyon system and are also found in rocks within the canyon. The presence of opal in these relatively young rocks tells scientists that water, possibly as rivers and small ponds, interacted with the surface as recently as two billion years ago, one billion years later than scientists had expected. The discovery of this new category of minerals spread across large regions of Mars suggests that liquid water played an important role in shaping the planet's surface and possibly hosting life.
October 28, 2008
The north polar layered deposits, and the bright ice cap that covers them, are very young (by geologic standards) features.
October 15, 2008
This image shows an example of layers in the Martian north polar deposits. These deposits, part of the Planum Boreum dome, are composed mainly of water ice and small amounts of dust.
September 29, 2008
Image of Hesperia Planum from the HiRISE camera on Mars Reconnaissance Orbiter.
September 18, 2008
The High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter took two images of the larger of Mars' two moons, Phobos, within 10 minutes of each other on March 23, 2008.
September 4, 2008