09.13.2017 Erosion Effects on "Vera Rubin Ridge," Mars
08.28.2017 Mars Lander Deck of NASA's InSight Mission
08.28.2017 Cruise Stage of NASA's InSight Spacecraft
08.28.2017 Hoisting NASA's InSight Lander
08.28.2017 Spacecraft Coming out of Protective Storage
08.09.2017 Clouds Sailing Overhead on Mars, Enhanced
08.09.2017 Clouds Sailing Overhead on Mars, Unenhanced
07.20.2017 Panorama Above 'Perseverance Valley' on Mars
07.20.2017 Compass and Scale Image for Phobos and Mars
07.20.2017 Phobos in Orbit around Mars
07.11.2017 'Nathan Bridges Dune' on a Martian Mountain
07.11.2017 'Ireson Hill' on Mount Sharp, Mars
07.11.2017 Mars 2020 CacheCam Sample Tube
06.29.2017 Traction control testing
06.21.2017 A.I. laser targeting
06.01.2017 Diagram of Lake Stratification on Mars
06.01.2017 Mars Reconnaissance Orbiter By the Numbers
05.23.2017 Testing Mars 2020's Engineering Cameras
05.22.2017 NASA's Mars 2020 Rover Artist's Concept #1
05.15.2017 Putting Martian 'Tribulation' Behind
05.15.2017 From 'Tribulation' to 'Perseverance' on Mars
03.30.2017 Measuring Mars' Atmosphere Loss
03.29.2017 Lifetime Achievement Award to Theisinger
03.29.2017 A Decade of Compiling the Sharpest Mars Map
03.21.2017 Break in Raised Tread on Curiosity Wheel
03.17.2017 COBALT/JPL team
03.09.2017 Back-to-Back Martian Dust Storms
02.27.2017 Swirling Dust in Gale Crater, Mars, Sol 1613
02.27.2017 Dust Devil Passes Near Martian Sand Dune
02.27.2017 Sand Moving Under Curiosity, One Day to Next
02.08.2017 Mars Reconnaissance Orbiter Observes Changes
01.26.2017 Mono Lake
01.25.2017 'Wing' Dike of Hardened Lava in New Mexico
01.25.2017 Blade-Like Martian Walls Outline Polygons
01.23.2017 Spirit And Opportunity By The Numbers
01.10.2017 Mars 2020 Rover - Artist's Concept
01.06.2017 Earth and Its Moon, as Seen From Mars
12.13.2016 Now and Long Ago at Gale Crater, Mars
12.13.2016 Where's Boron? Mars Rover Detects It
Gullies and Flow Features on Crater WallThis image from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter shows a sample of the variety and complexity of processes that may occur on the walls of Martian craters, well after the impact crater formed.
At the very top of the image is the high crater rim. At the bottom of the image is the crater's central peak, a dome of material rising above the surrounding crater floor. The central peak was uplifted during the impact event.
Reaching down the walls of the crater are winding and crooked troughs, or gullies. Some of these gullies may have formed with the help of liquid water, melted from ice or snowpack on the crater walls or from groundwater within the walls. Also notable is the long tongue-like lobe stretching down the middle of the image, with a darker, rounded snout and prominent parallel grooves on its surface. These characteristics, together with faint cracks on its surface, suggest that this lobe may have formed by movement of ice-rich material from up on the crater wall down to the crater floor.
Because surface features on this lobe and on most of the gullies do not appear sharp and pristine, and because wind-blown dunes have blown up on the front snout of the lobe, and because there are several small craters on the lobe's surface, the movements of ice-rich material and possibly water have probably not occurred very recently.
This image covers a swath of ground about 6 kilometers (4 miles) wide, centered at 32.4 degrees south latitude, 103.2 degrees east longitude. It is one product from HiRISE observation ESP_013726_1475, made on July 1, 2009. Other image products from this observation are available at http://hirise.lpl.arizona.edu/ESP_013726_1475.
NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology, Pasadena, manages the Mars Reconnaissance Orbiter for the NASA Science Mission Directorate, Washington. Lockheed Martin Space Systems, Denver, is the prime contractor for the project and built the spacecraft. The University of Arizona, Tucson, operates the HiRISE camera, which was built by Ball Aerospace & Technologies Corp., Boulder, Colo.
Image Credit: NASA/JPL-Caltech/University of Arizona