Martian sand dunes caught in motion

Images from spacecraft show dunes and ripples that have been pushed by wind as much as three metres.

NASA’s Mars Reconnaissance Orbiter has caught sand dunes on the surface of Mars in the act of shifting. Images from the spacecraft show dunes and ripples that have been pushed by wind as much as three metres over the course of several years.

“Mars either has more gusts of wind than we knew about before, or the winds are capable of transporting more sand,” Nathan Bridges, planetary scientist at the Johns Hopkins University and lead author of a paper in Geology, said in a press release, “We used to think of the sand on Mars as relatively immobile, so these new observations are changing our whole perspective.”

SOURCE: wired.com

Published in The Express Tribune, November 19^th, 2011.