06-20-2018, 02:16 PM
(06-20-2018, 02:41 AM)Avalancheon Wrote: Our galaxy is over 13 billion years old, and contains 400 billion stars. This strongly implys that many advanced civilisations ought to have come into existence by now. And yet, we find no real evidence of intelligent life beyond our own. Therefore, there must be some barrier that prevents life from evolving to the point where it can spread among the galaxy.
We haven't been looking that long.
Perhaps xeno-civs hundreds of millions of years old don't conform to our naive speculations that they should have a megastructure-fetish and blast gamma ray death beams out their tailpipes.