A thought experiment I've been considering:
I've heard it said on a few occasions that if the ice at mars poles was transported to the bottom of hellas basin by magic tomorrow it would melt during summer to water and make hellas habitable to simple life, which has got me thinking: could it really be that easy?
What would be the minimum changes to make the martian surface, or even a part of it habitable to some kind of life?
And if in a moment of arrogance/ altruism we decided to perform such an experiment what things might we learn?
Edit: I do realise that with it's lack of magnetic field and low gravity any habitable zone set up on mars would ultimately be doomed, so lets say we make it an experiment lasting 100 years. And to give an idea of what I mean by 'habitable', I mean to critters like this, and other extremophiles.