La photothèque planétaire d'orsay Regional Planetary Image Facilities
Home page > Mars > Resistant Crater Ejecta

Resistant Crater Ejecta

Monday 16 May 2011

Image Credit:NASA/JPL/ASU

Mission: 2001 Mars Odyssey.

Instrument: Thermal Emission Imaging System (THEMIS).

The ejecta of this unnamed crater in Amazonis Planitia is more resistant than the material around it. Scientists think these craters form when the force of an impact throws an apron of ejecta around a new crater. When the debris comes to rest, it contains mostly rock, mixed perhaps with some water from the subsurface. Extending outward, the apron armors the ground against erosion.

As years pass, scientists argue, the topmost layers of the surrounding plains erode due to winds or climate change or other factors. This lowers the ground around the crater, except where the ejecta covered it.

Orbit Number: 40003
Latitude: 7.58455
Longitude: 195.999
Instrument: VIS
Captured: 2010-12- 21 04:44

Université Paris-Sud 11 Faculté des Sciences GEOPS CNRS
RSS 2.0 | Site Map | Private area | SPIP