05.15.2017 Putting Martian 'Tribulation' Behind
05.15.2017 From 'Tribulation' to 'Perseverance' on Mars
04.20.2017 Chemical Laptop Team
04.20.2017 Subcritical Water Extractor
04.20.2017 Chemical Laptop
04.20.2017 Atacama Landscape
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
11.15.2016 Schiaparelli Impact Site on Mars, Stereo
11.03.2016 Schiaparelli Impact Site on Mars, in Color
10.17.2016 MAVEN Captures Rapid Cloud Formation
10.17.2016 Mars' Nightside Atmosphere
10.17.2016 Ultraviolet Image Near Mars' South Pole
10.17.2016 Ultraviolet Mars Reveals Cloud Formation
10.05.2016 Dust Haze Hiding the Martian Surface in 2001
10.04.2016 Test of Lander Vision System for Mars 2020
10.03.2016 A Sharpened Ultraviolet View of Mars
10.03.2016 Curiosity Self-Portrait at 'Murray Buttes'
10.03.2016 Butte 'M9a' in 'Murray Buttes' on Mars
Martian 'Spiders' in Sharper Look, Thanks to VolunteersThis image shows spidery channels eroded into Martian ground. It is an example from high-resolution observation of more than 20 places that were chosen in 2016 on the basis of about 10,000 volunteers' examination of lower-resolution images of larger areas near Mars' south pole.
These sharper looks use the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter. The volunteers, through the Planet Four: Terrains website, categorize surface features in images from the same orbiter's Context Camera (CTX).
This image is a portion of HiRISE observation ESP_047487_1005, taken on Sept. 12, 2016, of a site at 79.4 degrees south latitude, 18.8 degrees east longitude. The ground area shown is about half a mile (0.8 kilometer) wide.
This terrain type, called spiders or "araneiform" (from the Latin word for spiders), appears in some areas of far-southern Mars that are covered by sheets of frozen carbon dioxide ("dry ice") during the winter. When the slab ice thaws from the underneath side in the spring, carbon dioxide gas trapped beneath the ice builds pressure until it rushes toward a fissure or vent where it bursts out. The venting gas carries dust and sand that it picks up as it carves these channels.
At this location, the spiders are surrounded by ground called "basketball terrain" because of its texture.
HiRISE and CTX are two of six instruments on the Mars Reconnaissance Orbiter, which began examining Mars in 2006. The University of Arizona, Tucson, operates HiRISE, which was built by Ball Aerospace & Technologies Corp., Boulder, Colorado. NASA's Jet Propulsion Laboratory, a division of Caltech in Pasadena, California, manages the Mars Reconnaissance Orbiter Project for NASA's Science Mission Directorate, Washington. Lockheed Martin Space Systems, Denver, built the orbiter and collaborates with JPL to operate it.
Image Credit: NASA/JPL-Caltech/Univ. of Arizona