Mars' Northern Polar Ice Cap (IMAGE) University of Texas at Austin Caption This is a view of the north polar region of Mars from orbit. The ice-rich polar cap (quasi-circular white area at center) is about 1,000 km across. It is bisected by a large canyon, Chasma Boreale, on the right side. Dark, spiral-shaped bands are troughs. Chasma Boreale is about the length of the Grand Canyon in the US and up to 2 km deep. Credit NASA/Caltech/JPL/E. DeJong/J. Craig/M. Stetson Usage Restrictions Proper credit must be given to: NASA/Caltech/JPL/E. DeJong/J. Craig/M. Stetson License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.