geomorphology

That Ancient Martian Ocean? It Might Have Been Frozen.

That Ancient Martian Ocean? It Might Have Been Frozen.

When we think “ancient Mars,” we often picture roaring rivers, warm oceans, and if we’re being optimistic, perhaps some simple life forms. But it’s also possible the Mars of eons past was not a water-covered paradise at all. It may, in fact, have resembled a giant, dirty snowball.