Showerthoughts

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A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.

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The reason why we never meet time travelers is because our civilization ends before the technology can come to fruition. (lemmy.world)

submitted 5 months ago by TheGiantKorean@lemmy.world to c/showerthoughts@lemmy.world

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Sort of similar to the Great Filter theory, but applied to time travel technology.

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[–] echodot@feddit.uk 13 points 4 months ago (1 children)

If time travel is possible it'll probably be limited to the lifeline of the time machine itself. You cannot travel back in time to a point prior to the invention of the first time machine.

[–] jkrtn@lemmy.ml 1 points 4 months ago

GR predicts "closed time-like curves," but they require weird conditions (an infinitely dense and infinitely long rotating string) or negative energy, and you can only ever travel to the start of the loop at the earliest.