The source is common sense (plus a paper I wrote about 16 years ago). If humans are responsible for a phenomenon, then fewer humans => less phenomenon.
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While pondering the existence and consequence of faster than light particles, I wondered if tachyons are real and useful then we can travel the galaxy in years rather than in millennia.How would the reality of tachyons help you (or another civilization) get anywhere fast if you're not made of them?
However, as Enrico Fermi pointed out in his famous lunch time paradox, we have seen zero proof of alien contact. So, either advanced extraterrestrials don't exist or exceeding light speed in space travel is impossible. Any thoughts on this?You suggest the only solution for the Fermi paradox is the light speed limitation. Here we are such an advanced civilization and the fastest speed we've been able to achieve is under 0.0001c. OK, I think we got a ship to go faster than that, but only by dropping off a cliff, not actually having the ship do it under its own power. The speed of light hasn't exactly been a barrier to us yet.