NASA - National Aeronautics and Space Administration

This image shows a radar view (top) and topographical view (bottom) of the north polar ice cap on Mars.

This map shows the thickness of the north polar layered deposits on Mars as measured by the Shallow Radar instrument on NASA's Mars Reconnaissance Orbiter.

This artist's animation illustrates how NASA's Mars Reconnaissance Orbiter used radar to map the insides of the north polar ice cap on Mars.