... Mars . ... Observing . ... Rolling in the wind . Rocks on Mars are on the move, rolling into the wind and forming organized patterns, according to new research. ... Although Mars is a windy planet, it would be difficult for the wind to carry small rocks, which range in size from a United States quarter to a softball, said Jon D. Pelletier, associate professor of geosciences at The University of Arizona in Tucson. ... Only registered members of Astronomy.com are allowed to comment on this article. ...