Planets Thought Dead Might Be Habitable
(SPACE.com)
Space / Astronomy Related News
SPACE.com - Astronomers have long talked about a "habitable zone" around a star as being a confined and predictable region where temperatures were not to cold, not to hot, so that a planet could retain liquid water and therefore support life as we know it.
Source: Yahoo! News: Space & Astronomy News
I think we have little knowledge in what actually lies on the surface out side of our solar system and we have also limited knowledge of what is in our system. I would wager there are limitless planets on which we could survive and adapt to with little effort.
I also think there is a new earth being formed in a twin system to us as we speak and one day we will reside there.