HOT on the heels of last week’s announcement that water has recently flowed
on Mars comes further encouraging news. The Red Planet has kept two to three
times as much of its water as we thought. But there is a catch—since
estimates of what it started with vary wildly, we still have very little idea of
exactly how much there is.
“It would be more exciting if I could tell you how much water is in the
Martian crust,” says Laurie Leshin of the University of Arizona in Tucson.
Nevertheless, her results do give us more reason to be…
