NASA: Liquid water once on Mars

[geo]

Originally Posted by KenWittlief

I think these guys need a reality check

isnt Mars twice as far from the sun as the earth is?

I could belive ice on Mars

but liquid water? wouldnt any body of water there freeze solid?

isnt the average temp at the equator something like -70°F

?!

Maybe Mars once had much more greenhouse gas, such as carbon dioxide, which keeps the planet warm enough to have water.

[Adam Y.]

http://www2.jpl.nasa.gov/galileo/status960813.html

isnt the average temp at the equator something like -70°F

Wouldn't be surprising since this is not the only planet pegged for containing liquid water. Europa is also another planet that may contain liquid water and that planet is farther away from the sun than Mars and Earth combined.
http://pirlwww.lpl.arizona.edu/HIIPS...eenberg_chaos/