Ah! Sort of like how Kelvin determined that the Earth was only 20 to 100 millions years old? (See https://blogs.scientificamerican.com/roots-of-unity/lord-kel

Ah! Sort of like how Kelvin determined that the Earth was only 20 to 100 millions years old? (See https://blogs.scientificamerican.com/roots-of-unity/lord-kelvin-age-of-the-eart/ https://blogs.scientificamerican.com/roots-of-unity/lord-kel...) For a sensible argument, one has to assume that current physics is true in the domain in which it has been tested - eg, that physicists haven't been faking all the results from the LHC. But assuming that physicists have already discovered everything is just hubris. The linked article says "...faster-than-light communication (which includes travel) breaks something very fundamental about physics, something that is often ignored by sci-fi..." So they're trying to prove that all those science fiction stories in which galactic civilizations communicate instantly by "ansibles" that operate using hyper-local disturbances in the quasi-immanent K-field are nonsense. Well, they are nonsense of course, being just made up. And I do think that FTL communication is very unlikely to be possible. But that's not the same thing as proving it is impossible.