scientists think that Mars could have had floods
relatively recently: maybe only 10 million years
ago. That’s recent in geologic terms:
Mars is probably over 4 billion years old.
their peak these floods may have carried 50,000
times as much water as the Amazon river on Earth.
site for the first MER rover is Gusev crater. It is believed to
have once been a crater lake. The channel that fed it is half a
mile deep and 500 miles long.
the water now? Some of it’s in the polar ice caps. But we
now know that there’s a lot of ice buried under the ground:
at least enough to fill Lake Michigan twice over. But right now
we can only detect water a few feet underground, so there could
be much more.