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Well, I’m glad we got to the bottom of what’s unrealistic about traveling back in time…
Time and space are pretty much linked so if you travel in time you can travel in spacetime :)
Yeah, but to my knowledge, you can only go forwards in time.
What you can do, is go forwards at a slower speed. So, if you sat yourself in a spaceship and accelerated to e.g. 10% of the speed of light, you might get out after what you perceive as a few years and find yourself in the year 2200 (I did not do the math), but you cannot go back from there.
Causal chains always have to follow causality. They can just do so less quickly, because, as far as my current understanding goes, the speed of light is actually the speed of causality.
(Sorry to bonk you with so much physics. I know that initial statement could have also come from someone who’s never heard of the theory of relativity…)
You just need to reverse entropy haha
The thing is, a time traveling device would be like the one on Futurama. It just makes time flow at different rates. What people generally think of is a time teleport. And due to the nature of spacetime, a time teleport is indistinguishable from a space teleport. So any teleport should require precise spacetime coordinates, and n9t jist either space or time coordinates.
Another interesting thing about futurama‘s time travel is that instead of going backwards in time, they kept going forward until another Big Bang happened, creating a universe identical to their old one. Then they were able to just keep going forward until they reached when they left
I think it’s more correct to say that we don’t know how to travel in the other direction on the time axis. It could also simply be our perception of time only works unidirectionally.
From a mathematics point of view, nothing is preventing going backwards in time… We simply don’t perceive time that way.
Practically, this does nothing for us.
The bitch is figuring out a the spatial point of reference.
I don’t remember the name of the novel, so somebody help me with this. The concept is basically that scientists invent time travel, but use it as a teleportation device instead. Set the machine by a few seconds, you teleport the distance covered by the Earth during that time. They even use the technique to plan for an assasination of Kim Jong Un. Loved that one. Some innovative sequences using the ‘time machine’.
Edit: Found it. It’s actually two books (original and sequel).
Split Second - https://www.goodreads.com/book/show/26216031-split-second
and
Time Frame - https://www.goodreads.com/book/show/37946554-time-frame
The first book takes its time revealing the ‘time travel’, but the second book dives head first into using the technology proficiently.
Accidentally read the second book thinking it was a stand alone. The story still held up so i made it half the book before i realized my mistake
It’s actually marketed as a standalone sequel, so you weren’t too far off. Plus I think the first one was more of an action thriller than about this invention. I actually don’t remember much from the first one. Most of what I remember is from the second one.
I hope there is an audiobook of these, sounds right up my alley
Same spot relative to what? What object do time machines use as a reference for their coordinates? It would make sense to be Earth, so it would be in the same spot all the time.
Weeeeell, not exactly.
It is true that things are all relative to each other. But think about it this was, if you fly out in a Starship in one direction for a light year, then turn around exactly 180 degrees and fly back, you wouldn’t arrive back at earth, right? Mainly because things are accelerating due to gravity. And acceleration breaks symmetry.
It would of course depend on how time travel works, but since time and space are linked, it wouldn’t be unreasonable to assume that you follow the same trajectory in space as you move through time. But that would be a straight line in the space+time dimensions still. Think of the paths in Minkowski diagrams.
In this case, it makes sense to time travel from space and land on a planet upon arrival. Maybe all UFOs are just time travellers after all?🤔
Relative to the position of the Earth, the Earth doesn’t move
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He said relative to the POSITION of the earth.
Whose relatives are we talking about and what positions are they in?
Some relative positions are irrelevant
The time machine inventor forgot that things move.
Yeah, time travellers are pretty one dimensional smh
Weak premise considering the principles of relativity, and how our current understanding of time travel is basically rooted in SPACE-time.
Yeah, the earth IS in the same place all the time relative to its own frame of reference.
which makes you wonder what frame of reference would be used when you’re time traveling to decide what location you go to
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I read that ages ago. Back in high school, in fact (I’m 46). I don’t remember it except the chapter where time is a flock of birds that you have to try to catch to stay youthful. The children can catch them but always let them go and the adults can never catch them.
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I remember it was in the new books section of the school library and I was attracted to it immediately and spent the day reading it instead of paying attention in my classes. I need to read it again. Thanks for bringing it up!
I always assumed that teleportation would need to also be present for time travel. Clearly, just an assumption.
But would they be skeletons?
If they were orbiting a star for long enough, maybe. (Long enough = thousand or millions of years) Maybe a skeleton in a small cloud ?
nah - freeze dried corpses
Nor the solar system, nor the galaxy, nor the universe
It’s amazing how plausible this is
Nice one 👌
Semi-relevant Tom Scott (actually about teleportation, but covers many of the same problems)
Teleportation is time-traveling as it allows you to be somewhere faster, change my mind
I agree, you have to time travel to travel faster than light no? (my understanding of physics id very elementary)
*any time
Since the universe is expanding.
