5 If there ends up being a way to reach other planets that may have at one point contained some type of life, Those that still retain an atmosphere.

        Would be the perfect world's to colonize, Since all planet seems to be produced in the same way, as are stars, the main difference would not be the chemical make-up of either but simple the size of either, and whether or not they were in the "Goldilocks zone" for habitation. Doing a complete study of the existing fossils of the planet, (no reason to think that there would not be fossils if the planet had life at one time) would tell us much of what type of life had existed, and what caused the extinction of that life.                          What we would then have to do, would be to reverse engineer whatever material had been removed from that particular planet to allow mankind to reestablish what was removed. Granted, if the planet has problems that would be too big to overcome on a planet-wide scale then either underground or underdomes, would be the only option. Of course, there would really be no other options in the beginning for some type of plantlife to flourish. Dan  

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