re: Spring found in Martian arctic
I'm sorry, but, we still don't know.
The 'ice' found there could well be made up of CO2 ice. As for that 'spring', it could have melted from the thrusters of the Phoenix lander. We still don't know what it's made out of.
I still have my doubts. Too close to the surface, it could well be CO2 ice, dig deeper, then frozen water may still be found.
Anything goes, I guess.
