12/08/2011 9:15am, #51
12/08/2011 5:20pm, #52
Check this out...fresh off the Opportunity rover.
THIS, according to NASA, is a vein of gypsum deposited by water on Mars, long ago.
"This tells a slam-dunk story that water flowed through underground fractures in the rock," said Steve Squyres of Cornell University, Ithaca, N.Y., principal investigator for Opportunity. "This stuff is a fairly pure chemical deposit that formed in place right where we see it. That can't be said for other gypsum seen on Mars or for other water-related minerals Opportunity has found. It's not uncommon on Earth, but on Mars, it's the kind of thing that makes geologists jump out of their chairs."