NASA publishes 44,000 Mars surface images
by Rob Beschizza from on (#1PZ76)
The HiRise imager in orbit around Mars shoots a continuous stream of data about its surface our way. Nasa's posted 44,000 images so far, each available in all sorts of formats and projections. You could have one a day as your desktop background and never run out.
Gullies in Dunes Dubbed Kolhar.