Vast Mars glaciers are spotted

The answer to a Martian riddle -- where did all the water go? -- may lie in debris-covered ice found by ground-penetrating radar on NASA's Mars Reconnaissance Orbiter spacecraft. In a discovery that partly answers the question of where all the water went on Mars, scientists have found vast, debris-covered glaciers much nearer the equatorial region than anyone had expected, according to a report Friday in the journal Science.

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