Re: Just add water
Yeah, that was pretty much my feeling too. (aside from the impactor theory. you could be correct, I just don't know a whole lot about that.)
The ages of the Tharsis and Elysium volcanic provinces are not well determined.
They date from billions of years old to a few hundred million.
Given the uncertainty, they could be active today, but it seems like an awfully big stretch.
Perhaps the Mars Odyssey mission will indirectly shed some light on the idea.
Could be?
Thanks g