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A cross-section of underground ice is exposed at the steep slope that appears bright blue in this enhanced-color view from the HiRISE camera on NASA's Mars Reconnaissance Orbiter. The scene is about 550 yards wide. The scarp drops about 140 yards from the level ground in the upper third of the image. | NASA/JPL-Caltech/UA/USGS
Planets

Vast Sheets of Ice Have Been Found on Mars

Researchers have identified eight, massive sheets of ice just below the Martian surface, and they appear to be relatively young deposits.

At this pit on Mars, the steep slope at the northern edge (toward the top of the image) exposes a cross-section of a thick sheet of underground water ice. The image is from the HiRISE camera on NASA's Mars Reconnaissance Orbiter, with an enhanced-color central swath between grayscale on each side. | NASA/JPL-Caltech/UA/USGS