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CellBioGuy comments on UFAI cannot be the Great Filter - Less Wrong Discussion
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I take issue with the assumption that the only two options are perpetual expansion of systems derived from an origin of life out into the universe, and destruction via some filter. The universe just might not be clement to expansion of life or life's products beyond small islands of habitability, like our world.
You cannot assume that the last few hundred years of our history is typical, or that you can expect similar exponentiation into the future. I would argue that it is a fantastic anomaly and regression to the mean is far more likely.
it doesn't need to be for us, only for things we build.
Right - but we can see how far apart the stars in our galaxy are, and roughly what it would take to travel between them. Intragalactic travel looks as though it will be relatively trivial - for advanced living systems.
I fail to see how your second sentence follows from your first. What do you mean by relatively trivial?
Human beings in the 1970s were able to throw a hefty chunk of metal (eventually) out of the Solar System, so interstellar travel doesn't require any future breakthroughs (though such breakthroughs would make it easier). See Project Orion for an early look at the feasibility of interstellar travel without space elevators, uploading, nanotechnology, or AI.