I thought it was clear from my post when I said "Mars-like" that excluded Mars. (Since the subject of debate is extrasolar planets.) And I was speaking in refe

I thought it was clear from my post when I said "Mars-like" that excluded Mars. (Since the subject of debate is extrasolar planets.) And I was speaking in reference to traveling to that planet, which is virtually impossible with current technology. And to expand a little more, I would say a generation ship of some sort would be required to get even to Alpha Centauri, so creating a self-sustaining ecosystem from whole cloth is a prerequisite for traveling to extrasolar planets. Now, you could make an argument that some magic FTL technology will appear, but I still think that terraforming is a trivial problem by comparison.