"A river ran through it." That's what NASA said when they saw the pictures and the evidence. It's what I thought when I heard the news. And we knew it, didn't we. We knew it. There was running water on Mars, free running water, a river that ran for maybe thousands of years, maybe more. The smooth, rounded gravel in the old river bed could have been made only by water. Wow.
I'm betting Curiosity finds evidence of life. We know that, too, don't we. Wow.
This photo is courtesy of NASA. They needed to label which riverbed came from which planet. Yes, seriously.