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Aug 2, 2018 at 21:28 comment added cmaster - reinstate monica @jwenting Oh time machines are not implausible. In fact, we are all sitting in one. Pity, it only moves into a single direction at constant speed... Jest aside, afaik, general relativity does allow time travel via wormholes. And those definitely have the feature of disallowing time travel to times before the time traveling wormhole has been created.
Aug 1, 2018 at 10:51 comment added Flater @MichaelKjörling: If we're already considering a universal temporal road block at a particular point in time; it's not as far-fetched to allow for other species to have caused this temporal road block. Even if they live across the galaxy and will never ever interact with us. The universal temporal road block is order of magnitudes larger in scope than alien life.
Aug 1, 2018 at 6:15 comment added user @jwenting Just because we're dealing with time travel doesn't mean the rest of what's going on can't be allowed to make a little sense. But to each their own.
Aug 1, 2018 at 5:51 comment added jwenting @MichaelKjörling less plausible than time machines?
Jul 30, 2018 at 6:01 comment added L.Dutch @MichaelKjörling, I agree, and I have checked that the OP didn't use the science-based tag before posting this.
Jul 30, 2018 at 5:57 comment added user While it does make for great entertainment, I'm not sure I'd consider much of The Hitchhiker's Guide To The Galaxy to be particularly plausible.
Jul 30, 2018 at 5:41 history answered L.Dutch CC BY-SA 4.0