this post was submitted on 02 Sep 2023
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Science Memes

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Why there are no time travelers. (mander.xyz)
submitted 1 year ago by [email protected] to c/[email protected]
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[–] [email protected] 16 points 1 year ago (5 children)

This is why I think time travel will require both an entry and an exit portal, though it’d be through the same device. You’d walk in the portal at one point in time and space, then walk out of the exact same portal at another point in time and space. You’d only be able to travel between points where that time device exists in time and space, you’re using the same portal to travel to a different time in its existence. So no traveling back to the time of dinosaurs or the beginning of time or going to any point past when the portal no longer exists anymore. It’d solve the problem of having to deal with galaxies/stars/planets moving through space and would help mitigate some paradoxes, though not all and maybe even create others.

[–] technohacker 12 points 1 year ago (2 children)

The game Quantum Break plays with this premise!

[–] [email protected] 1 points 1 year ago* (last edited 1 year ago)

That was my first thought as well! What a neat game.

[–] [email protected] 9 points 1 year ago (1 children)

Calculations of the movement of celestial bodies is pretty accurate though. Figuring out where the earth was in the past is the simple part of time travel. Additionally you could just combine a time machine with a space ship and return to space nearby where the planet would be and then have a lander module or something just in case.

[–] [email protected] 2 points 1 year ago

Exactly, though there still is a possibility of exiting inside another celestial body, which is a whole another can of worms

[–] [email protected] 2 points 1 year ago* (last edited 1 year ago)

If I recall correctly that was the premise on “Contact”, where Jody Foster asked her father what was that thing that brought her there and he stated he didn’t know, that they were left there by something else (the wormhole thingy). Sorry for all the nonspecifics and all.

[–] [email protected] 0 points 1 year ago (1 children)

Exactly. An anchor in space is required for time travel. One variable has to be constant at least.

[–] [email protected] 1 points 1 year ago

Space and time are the same thing in the end.