More From Mars - Glaciers!

Glaciers have been spotted on Mars before, but these, perched on the edge of the Hellas Basin, buried under rocky rubble, which is why they haven't evaporated, are huge - the second-largest known source of water on Mars after the polar caps:

"Just one of the features we examined is three times larger than the city of Los Angeles and up to one-half-mile thick. And there are many more. In addition to their scientific value, they could be a source of water to support future exploration of Mars."