Dunes of sand-sized materials have been trapped on the floors of many Martian craters. This is one example, from a crater in Noachis Terra, west of the giant Hellas impact basin.
The High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter captured this view on Dec. 28, 2009.
The dunes here are linear, thought to be due to shifting wind directions. In places, each dune is remarkably similar to adjacent dunes, including a reddish (or dust colored) band on northeast-facing slopes. Large angular boulders litter the floor between dunes.
The most extensive linear dune fields know in the solar system are on Saturn's large moon Titan. Titan has a very different environment and composition, so at meter-scale resolution they probably are very different from Martian dunes.
This image covers a swath of ground about 1.2 kilometers (three-fourth of a mile) wide, centered at 42.7 degrees south latitude, 38.0 degrees east longitude. It is one product from HiRISE observation ESP_016036_1370. The season on Mars is southern-hemisphere autumn. Other image products from this observation are available at http://hirise.lpl.arizona.edu/ESP_016036_1370.
The University of Arizona, Tucson, operates the HiRISE camera, which was built by Ball Aerospace & Technologies Corp., Boulder, Colo. 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.
Warangler Sahara.. again.. :p, Kamsack SK Oct 29 2012 - 오늘 월요일.. 우리 호텔의 레스토랑이 쉬는 날이다. 호텔의 바(술집)는 연중무휴로 열지만 레스토랑은 월요일 날 쉰다. 바는 우리 직원들인 바텐더들이 있기 때문에, 난 거의 신경을 안쓴다. 주류 재고와 돈만 챙긴다.. ㅎ 좌간, 내가 지금 주력하고 있는 레스토랑에 별일이 없...
5 years ago