Headlines > News > Picture of the Day - Proctor Crater, Mars

Picture of the Day - Proctor Crater, Mars

Published by Matt on Mon Dec 7, 2009 8:10 pm via: NASA
Share
More share options
Tools
Tags

This view from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA’s Mars Reconnaissance Orbiter is of the Proctor Crater. The relatively bright, small ridges are ripples.

From their study on Earth, and close-up examination by the MER rovers (roving elsewhere on Mars), scientists surmise that the ripples are composed of fine sand (less than 200 microns in diameter) or fine sand coated with coarser sand and granules.

Proctor Crater, Mars. Credit: NASA

Proctor Crater, Mars. Credit: NASA

The larger, darker bedforms are dunes composed of sand, most likely of fine size. Ripples tend to move slower than dunes. Because of this, over time, ripples get covered with dust, possibly explaining the bright tone visible here. The dunes are dark probably because they are composed of basaltic sand (derived from dark, volcanic rock) that is blown by the wind enough that dust does not sufficiently accumulate to change their color.

This area in Proctor Crater is being monitored by HiRISE to document any changes over time.

This image is a portion of the HiRISE observation taken on Feb. 9, 2009.

No comments
Start the ball rolling by posting a comment on this article!
Leave a reply
You must be logged in to post a comment.
© 2014 The International Space Fellowship, developed by Gabitasoft Interactive. All Rights Reserved.  Privacy Policy | Terms of Use