The High Resolution Imaging Experiment (HiRISE) has confirmed that a dark pit seen on Mars in an earlier HiRISE image really is a vertical shaft that cuts through lava flow on the flank of the Arsia Mons volcano. Such pits form on similar volcanoes in Hawaii and are called "pit craters."
The HiRISE camera, orbiting the red planet on NASA's Mars Reconnaissance Orbiter, is the most powerful camera ever to orbit another planet. It is operated at The University of Arizona in Tucson. HiRISE Principal Investigator Alfred McEwen of the UA's Lunar and Planetary Laboratory and his team released the new image of the dark pit on Arsia Mons and several other stunning images today on the HiRISE Web site, http://hirise.lpl.arizona.edu. New HiRISE images are released on the site every Wednesday.The UA-based HiRISE team also released another 930 images to the Planetary Data System (PDS), the U.S. space agency's mission data archive, today.
These images, taken between May and July 2007, include a view of what at first glance looks deceptively like a mesa set in Swiss cheese terrain. But it's a case of "trompe l'oeil," an eye trick -- the feature is a crater.
The "Swiss cheese" terrain is carbon dioxide ice that "sublimates," or thaws from a solid directly into gas, during the summer, which it currently is at this south polar region of Mars. Carbon dioxide sublimating on steep slopes changes the shape of pits and mesas from year to year. The large depression in this image might be an impact crater, McEwen said, although it's hard to be sure because there's no raised rim or ejecta. Impact craters on the ice cap are modified as the ice-rich terrain "relaxes" over time and as they are resurfaced by the annual deposition and sublimation of frost and ice.Another image shows a very recent "rayed" dark impact crater among older pocks in the lighter, dust-covered surface. An extremely recent impact, perhaps only a few years or decades ago, created the dark spot with radial and concentric patterns in this HiRISE image. The small central crater is only about 18 meters wide (60 feet), but it formed a dark spot 700 meters wide (two-fifths mile) with rays of secondary craters reaching as far as 3.7 kilometers (more than two miles) from the central crater, McEwen said.
Secondary craters are rocks ejected from the central crater. "This region of Mars is covered by dust, and the impact event must have removed or disturbed the dust to create the dark markings," McEwen said.All HiRISE images released to the PDS can be viewed from the HiRISE site.
Today's release adds another 1.8 terabytes to the PDS. The project turned over its first 1,200 HiRISE images to PDS last May. The PDS now holds a total 3.5 terabytes of HiRISE data, one of the largest single datasets returned from a spacecraft and archived in NASA's space mission library.Internet users can explore the images with the user-friendly "IAS Viewer"
From rocks in Colorado, evidence of a 'chaotic solar system'
23.02.2017 | University of Wisconsin-Madison
Prediction: More gas-giants will be found orbiting Sun-like stars
22.02.2017 | Carnegie Institution for Science
Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...
The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.
The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...
Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...
Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".
Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...
13.02.2017 | Event News
10.02.2017 | Event News
09.02.2017 | Event News
23.02.2017 | Physics and Astronomy
23.02.2017 | Earth Sciences
23.02.2017 | Life Sciences