Forgot to point to this the other day: Opportunity finds evidence of water in Mars’ past. Probably you’ve all heard this by now, but it’s still incredible.

“Liquid water once flowed through these rocks. It changed their texture, and it changed their chemistry,” said Dr. Steve Squyres of Cornell University, Ithaca, N.Y., principal investigator for the science instruments on Opportunity and its twin, Spirit. “We’ve been able to read the tell-tale clues the water left behind, giving us confidence in that conclusion,” he said.