In a different position relative to what?
Time travel doesn't work unless you also have teleportation. If you travel to the past/future, Earth will be in a different position in its orbit, and you'll die in space.
Submitted 1 day ago by Balerion6@lemmy.world to showerthoughts@lemmy.world
Comments
Bwaz@lemmy.world 16 hours ago
01189998819991197253@infosec.pub 15 hours ago
Bwaz@lemmy.world 13 hours ago
What point in space is the reference, where other things are placed relative to?
Fetus@lemmy.world 1 day ago
I get that people just refer to them as time machines, but they’re actually space-time vehicles.
Before your first journey, you calibrate it to a reference point (mine already had Earth mapped out, with a gravity well depth monitor as a fail-safe) so that you lock your target coordinates in space and time.
But no, it’s not teleportation. You’re still just travelling to your destination, you just get there as quick as you want and without the need to be disintegrated.
Fleur_@aussie.zone 8 hours ago
Alternatively teleportation doesn’t work unless you also have time travel
kryptonianCodeMonkey@lemmy.world 21 hours ago
Space and time are the same thing. Spacetime. Time travel would necessarily also by teleportation if you are traveling instantaneously through spacetime. Unless of course your travel is continuous like it is currently for all of us, just sped up, slowed down or reversed.
Also there is n9 objective point of reference for location in the universe, only relative points of reference. In other words, you are always some distance in some direction from some thing. But you never have objective stable coordinates relative to the universe itself. Tere is no “center” or other fixed point of the universe. So the earth is moving, yes, but only relative to other independent celestial bodies. And those bodies are moving, too, relative to other bodies. Their movement is always relative to a non-absolute frame of reference. No movement is objective to the universe, it’s all relative.
So it would be illogical to expect the earth to have moved X miles away in Y direction if you teleported one second into the past/future because that would presuppose that your location was objective and absolute in the universe at the point of time traveling and the earth moved relative to your absolute location. It would break known physics if that were the case, as much as time travel itself would.
mechoman444@lemmy.world 19 hours ago
🤔
If only there was some kind of theory that could explain relativity.
Especially in large celestial objects.
01189998819991197253@infosec.pub 15 hours ago
Space is full of time travelers that forgot to include the Zed access into their calculations.
toynbee@lemmy.world 12 hours ago
Zed access sounds a lot cooler and more scifi than z axis.
01189998819991197253@infosec.pub 15 minutes ago
Hahahahaha!!! Oh, man. Speech to text did not do me well earlier hahahahah
Durandal@lemmy.today 1 day ago
You just need to maintain a relationship between Time And Relative Dimension In Space. 🟦
Simulation6@sopuli.xyz 1 day ago
– Time And Relative Dimension In Space
or TARDIS for short?
Kolanaki@pawb.social 1 day ago
I think it might depend on how the time travel is achieved. We all assume you’re just instantly pooped out in your destination time but if you have to actually travel through time, it might be like just putting everything in reverse, and so you’d move alog with the earth as you move backwards through some kind of time tunnel.
Think Donnie Darko and not Looper.
gedaliyah@lemmy.world 1 day ago
This was the thing in the HG Wells version that always got me. The machine always exists for the intervening time. I feel like that would be very disruptive to the civilizations that encounter it.
Death_Equity@lemmy.world 1 day ago
I think the distortion field sort of addresses that.
The machine would be hidden within the field and invisible and intangible. That of course presents the problem of ending up in a wall and also would likely mean that you would end up in the air if the ground erodes or in the ground if sediment is deposited.
The alternative is either there is a mysterious bubble that becomes a scientific curiosity or there is the machine with someone frozen inside it that is destroyed by people being people. Both have their own fun little narratives to explore.
That is all based on the assumption that the machine travels forward in time through localized dilation instead of folding spacetime, which would mean it has two methods to travel depending on it going forwards or backwards in time.
dwraf_of_ignorance@programming.dev 1 day ago
cm0002@lemmy.world 1 day ago
I…I need the template for that meme :o
Ofiuco@piefed.ca 1 day ago
Did you get it?
I kind of want it too for... Reasons... Stupid stupid reasons.ByteJunk@lemmy.world 1 day ago
For science?
RagingSnarkasm@lemmy.world 1 day ago
Tell me you didn’t pay attention in Spatial Distortion as Applied to Time Dilation class without telling me you didn’t pay attention in Spatial Distortion as Applied to Time Dilation class.
LovableSidekick@lemmy.world 20 hours ago
jj4211@lemmy.world 17 hours ago
Or, in that case, stealing someone else’s spaceship time machine
01189998819991197253@infosec.pub 15 hours ago
Never go in against an Australian when death is on the line!
One of the best charactera
samus12345@sh.itjust.works 21 hours ago
That’s correct. But if you’ve figured out how to travel through time, traveling through space should be easy.
Also, be sure to wear a hazard suit so you don’t die from any ancient/future diseases your body has no protection from.
TabbsTheBat@pawb.social 1 day ago
What if it works by reversing/fastforwarding time outside while preserving things within the time machine? Then as long as the time machine is grounded to the earth it would move with it
KoboldCoterie@pawb.social 1 day ago
So, Primer, then? Where you turn on the time machine at the point you want to return to, and when you get into it in the future you’re returned to that point?
otacon239@lemmy.world 1 day ago
That’s why I always liked approaches that use a physical machine that has to stay in one place for an extended period of time. Quantum Break’s hard sci-fi approach to this was fascinating and kept making me reconsider how the time loop worked. Highly recommended for time loop nerds like me.
agamemnonymous@sh.itjust.works 18 hours ago
I’m convinced that if there’s a way to build a time machine, it’ll probably work like Primer.
jordanlund@lemmy.world 1 day ago
Forget the orbit… remember the song…
genius.com/Monty-python-the-galaxy-song-lyrics
“Just remember that you’re standing on a planet that’s evolving
And revolving
at 900 miles an hour.
It’s orbiting at 19 miles a second,
so it’s reckoned,
The sun that is the source of all our power.
Now the sun, and you and me,
and all the stars that we can see,
Are moving at a million miles a day,
In the outer spiral arm,
at 40,000 miles an hour,
Of a galaxy we call the Milky Way.”VicksVaporBBQrub@sh.itjust.works 1 day ago
A wormhole type time machine would leave the travel points A and B physically independent of each other. This opens up the option to change destinations… step in at New York, exit in San Francisco.
7uWqKj@lemmy.world 1 day ago
Due to the energies involved, creating a wormhole between two cities would probably leave you with a wormhole and no cities.
rikudou@lemmings.world 1 day ago
Those are just small issues that will be solved after few tries.
realitista@lemmy.world 23 hours ago
Maybe if you timed it juuuuuust right you could land somewhere on the planet as it orbits the sun? I mean I guess it depends on how you determine absolute location in the universe. Is that even possible with the universe constantly expanding?
massacre@lemmy.world 21 hours ago
Nope, not possible. The solar system itself is moving as is the galaxy… it’s useful to think of Earth’s orbit as spiraling around the sun in the direction our star is traveling. So 1 orbit later we have not come to the same location.
MTK@lemmy.world 1 day ago
Being sci-fi it can be explained with ^Q^ ~u~ ^a^ ~n~ ^t^ ~u~ ^m^ ^E^ ~n~ ^t^ ~a~ ^n^ ~g~ ^l^ ~e~ ^m^ ~e~ ^n^ ~t~
ns1@feddit.uk 1 day ago
This is interesting because the most “realistic” (i.e. still not realistic) depictions of time travel in fiction involve travelling through a singularity or wormhole. So you probably have to be in space to start with, but also both ends of the wormhole have mass so they can be orbiting a planet or star and stay within a stable distance of it. It solves this particular problem (just leaving the other usual problem of causality!) It also proves your point since it does allow travelling in space, in fact it allows travelling faster than light.
I think the converse is true as well, that if faster than light travel is possible then time travel must be possible, at least if you take relativity at face value. As others have pointed out there’s no universal reference frame, and for any journey that is faster than light in one reference frame, there is another frame in which the journey goes backwards in time.
takeda@lemmy.dbzer0.com 1 day ago
That’s why they used Delorean.
rowinxavier@lemmy.world 1 day ago
Yep, and not to mention the position of our solar system in the Milky Way or our galaxy in the local cluster. In fact, without a specific reference frame you would have to make corrections very rapidly for even a tiny jump in time.
toast@retrolemmy.com 1 day ago
Depends on how time travel works. I mean, within the next 24 hours I plan to travel to tomorrow. I’m not going to be taking any of that into account.
Hugin@lemmy.world 1 day ago
There was a not very good TV show Seven Days that used this well. They had a time machine that could go back in time seven days. The pilot had to fly the machine chasing the earth as he traveled back in time.
He would usually end up crashing it somewhere and have to find a phone to call for pickup.
rowinxavier@lemmy.world 15 hours ago
Yep, and he had to also solve the problem of the week given everything they could figure out in the 7 days following it happening. A cool set of limitations for the writers, the execution was a little sloppy, but overall a cool idea.
bvoigtlaender@feddit.org 1 day ago
All my childhood i was scared about being stuck in a building that was there back then. If i knew that was my smallest problem i would have scratched that idea long ago.
TheLeadenSea@sh.itjust.works 1 day ago
What sort of universal reference frame do you seem to be assuming? All location is relative to other things, and keeping your location relative to, say, the Earth would be a lot more convenient that making it relative to some arbitrary star or something.
TrickDacy@lemmy.world 1 day ago
Op thinks the universe is built with some inherently absolute positioning method. Thanks for writing this
half_built_pyramids@lemmy.world 1 day ago
Use the time and space machine on a ruler and send it back in time a pico second, then a millisecond, then a thousand, then a second, then a minute. You just have to calibrate with measurements first.
TommySoda@lemmy.world 1 day ago
But if you’re in a moving car and “pop” back a few seconds while the car doesn’t you won’t be in the car anymore. If it worked more like rewinding a video you wouldn’t need to do much, but I’m assuming OP means literally going “poof” and now you’re back in time. If that’s the case, you would still need to know how Earth is moving through spacetime. If you don’t know your relativistic relationship to the Earth and every other object in the universe then how would you know where you are or your own relativity compared to the Earth?
Dave@lemmy.nz 1 day ago
Their point is that (as per relatively), all movement is relative to something. So if the earth moved away then you must be measuring in relation to some other reference point. There is no absolute positioning system. So when you say the earth is moving, what is it moving in relation to? And why did you pick that reference point instead of having a time machine that uses earth itself as a reference point?
7uWqKj@lemmy.world 1 day ago
Exactly, and due to earth’s rotation you don’t even need the car.
fubbernuckin@lemmy.dbzer0.com 1 day ago
I’m using the microwave background as a reference
daniskarma@lemmy.dbzer0.com 23 hours ago
I tried, but then it started blinking.
kryptonianCodeMonkey@lemmy.world 20 hours ago
The microwave background is like a rainbow. When you move, it appears to move. You’re always at the “center” of it.
TheLeadenSea@sh.itjust.works 1 day ago
Lol, that’s omnipresent