But one has to take into consideration that life on earth reaching such sophisticated levels was a mere fluke if we are to go by Darwins theory. Though I have no doubt that life reaching the early plantae stages is entirely possible on this Gliesa 581 the chances of reaching it within a lifetime with current technology is null and that techology needed still wont be acquired within a few centuries. If these ion engines are constantly accelerating it might take a few decades to reach lightspeed aka 299 792 458 m / s. Even if the distance were far even for lightspeed it would not be a problem if lightspeed could be attained quickly as time slows down in lightspeed. I predict habitation of such planets by 2700 myself though science has come so far in 100 years so hopefully it might be quicker as regarding earths dwindling resources.
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