NASA spacecraft read layered clues to changes on Mars
NASA/JPL-Caltech/Univ. of Arizona.Polar layered deposits exposed in a scarp at the head of Chasma Boreale, a large canyon on Mars.Mars climate history, recorded in ice-rich deposits near the poles, on crater-wall cliffs and ancient sand dunes, is being revealed by a trio of NASA instruments now flying over and rolling across the planet, suggest Washington University in St. Louis researchers playing key roles in the mission.