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/sci/ - Science & Math

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7102093 No.7102093[DELETED]  [Reply] [Original]

Suppose time travel is possible.

Should an individual decide to travel to a past time in Earth, would they not also need to travel through space? That is, to the location the Earth was during that time.

>> No.7102101

>>7102093
If they went back to the exact same date, they could be a couple miles off due to the earth slightly changing distance from the sun.

And the machine would travel through 4d space anyway.

>> No.7102110

>>7102101
So, assuming this machine is capable of travelling backwards in time, it would also need to be able to change it's 3 dimensional position as well?

>> No.7102118

>>7102101
so they might materialize a few miles inside the earths crust?

>> No.7102139

What would you even use as a point of reference in this scenario? The Earth's position relative to the sun; to the center of the galaxy? There is no universal fixed pint in the universe, just positions relative to other things. If you can pick them arbitrarily just pick a point on Earth and you don't have to move anywhere.

>> No.7102141

>>7102110
Supposedly backwards time travel is not possible cause of paradoxes

If you were to go back in time and stop your own birth, you would stop your own existence, but at the same time, you would have stopped yourself from stopping your birth in the first place, which doesn't make any sense.

>> No.7102177

>>7102141
What does this have to do with my question?

>>7102139
Regardless whether there is a universal point of reference, the galaxy itself is moving in relation to other galaxies. The Sun is moving in relation to other stars in our galaxy. Our Earth is moving in relation to other planets.

If we were to travel 100 years into the past, our location seems like it would still be relatively similar to it was 100 years in the future. The only difference would be the Solar system wouldn't be where we are, yet.

>> No.7102178

>>7102093
>Suppose time travel is possible.
That's like saying "suppose 1+1≠2."
It can work, but your statement is much too vague for any specific questions to be answered.

>> No.7102194

>>7102178
Time travel is possible, at least we know of the uni-directional sort. My question is just as relevant for time travel to the future as well.

>> No.7102204

>>7102194
Nope.

Yes, time-travel to the future is possible, and in fact it happens quite often (we detect muons in the atmosphere, even though they should have already decayed).
Time travel to the past, on the other hand, is much more complicated.

And even if you could travel on arbitrary paths through spacetime, we can't talk about the "same location" between different time slices of spacetime; it doesn't make sense, mathematically or physically.
(Of course, when we are not worrying about general relativity, talking about the same location at different times is common; but when we talk about time travel, the situation is quite different).

>> No.7102418

>>7102204
So you say nope, but then agree with me?

>> No.7102455

>>7102418
>doesn't read the post
>makes stupid comment

>> No.7102513

>>7102178
you are going to enjoy a lot of success in your life

>> No.7102519

>>7102513
Suppose you're wrong.

>> No.7102556

No OP. People are only able to travel backwards in time to when the time-travel machine was created (think about it). This also negates the spatial requirement.

>> No.7102575

Perhaps one could create a time machine in your reality, and make it follow locations in space that coincide with Earth's gravitational well. Then you wouldn't have to worry about opening up the door and being half-way to the Oort cloud.

>> No.7102592
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7102592

TIME TRAVEL IS NOT POSSIBLE YOU FUCKING INEPT NEOTENOUS CRETIN. FUCK. Time is just the mathematical measurement of movement. To restore the universe back to the way it was you'd have to rearrange all of the energy in the universe back to where it was during a certain time period. I fucking hate all of you faggots.

>> No.7102598

>>7102455
>Nope
>Yes, time-travel to the future is possible

>>7102194
>Time travel is possible, at least we know of the uni-directional sort.

Gotta love pseudo-intellectuals.

>>7102556
I'm asking whether travelling through the fourth dimension (time) means you must also travel through the other 3 dimensions. That is, if you go back to 1900 Earth, will you also be located where 1900 Earth was at the time?

>>7102592
We are all currently travelling to the future. You can even travel to the future more quickly, thanks to relativity.

>>7102575
This is the only thing I could think of that would keep you near the place you want to be. I can't imagine being able to escape the physical effects of objects around you while travelling through time. I mean, it works for us presently after all?

>> No.7102649

>>7102093
maybe, your machine might re-trace it's starting position through 4D space time all the way back to an end position so that you don't end up somewhere else.

>> No.7102682

>>7102093

Either you exist in a closed time like curve and then you are set. If not then all you can do is skew the manifold with respect to your 4-vector

>> No.7102710

>>7102598
>>Nope
>>Yes, time-travel to the future is possible

You mongoloid, read the damn post:
>>7102204
>Time travel to the past, on the other hand, is much more complicated.
The guy I was responding to said that the question applies equally to time travel in both directions, which is wrong.

>> No.7102777

>>7102710
Nope. Ready it again. He's clearly saying that it applies to future time travel just as well as to the past. In other words, it seems he was conceding that time travel to the past may not be possible, but that we know travel to the future is.

>> No.7102811

There are two ways to go back in time there are none but for the sake of the thread

First one is to reverse the time of the whole universe, moving all particles towards their past positions, which basically means that you also delete your current knowledge and memory and end up clueless when you reach it.
The second one is to do it personally and jump to another point in the 4d. There's a major problem with that tho - you will either erase yourself the moment you land in, which makes it impossible for you and that event to exist because you don't have a cause, or you will add your particles to the universe without removing anything, which is also impossible because you would be adding particles without a cause and would be stuck in a loop where you'll keep adding particles in the universe till infinity.

If you do it the second way, you will end up in empty space because the galaxies move constantly. If you do it the first way, you won't realize that you've traveled in time.

>> No.7102953

>>7102093

to travel backwards in time, you must travel forwards in time.

it is reccomended that you remove your time machine from local space so that various debris like black holes don't destroy you during your travels. so you need to leave the universe and come back later, which means that yes, you need to travel through space.

>> No.7102954
File: 992 KB, 389x259, 1404214054401.gif [View same] [iqdb] [saucenao] [google]
7102954

>>7102519

>> No.7103628

>>7102811
>If you do it the first way, you won't realize that you've traveled in time.
I believe this is a problem most people think can be solved by an ancient time machine. As you pointed out though, the time machine itself would have to be able to protect you from the regressive timeline.

Could it be possible to go back in time? Well, from I understand, the Universe is essentially a 4d Mobius strip. So, in essence, we're viewing a 4d universe through 3d slices. Much like a catscan or MRI views a 3d object with 2d slices.

I would think though that your best bet would be utilizing a strong gravity well to maintain your relative position.

>> No.7103635

>>7103628
>Well, from I understand, the Universe is essentially a 4d Mobius strip.
wat?
the universe is flat, or a 3-sphere, or hyperbolic.

>> No.7103667

>>7103628
>As you pointed out though, the time machine itself would have to be able to protect you from the regressive timeline.

And the thing that would protect the time machine, and the other thing that would protect the thing that protects the time machine, and you end up with infinite protections. There's literally no way to send present information back in time.

>Could it be possible to go back in time?
It is, if you don't exist in this universe and don't carry any information. Good luck with that

>> No.7103694

>>7102093
maybe could the doctor who hypothesis could be real.
if we can materialize Time (Timevortex) and access it.

>> No.7103722

>>7102141
Thats assuming time is even self correcting. Lets put it this way, if you went to earth in 150 million BC then guess what? You created a time loop where you randomly pop into existence 150 million years before you are even born for a couple of minutes then poof out of existence in other words you are just like the big bang you came out of nowhere. Now what does this mean?It means you could kill your grandpa and still exist only you would never be born instead you existence starts the moment you poof into existence when you time traveled to your grandpa's time.

>But if you were never born then what about the time machine?
The time machine isnt taken into account only you poofing into existence at that specific time.Why? Time doesnt work around it simply goes forward and since the present doesnt exist from your perspective then what effect it has on you is nothing at all. Since you are now capable of an impossible existence what else can you do?

Suppose you killed yourself as a baby well that means your baby you never existed and only adult you who just poofed into existence exist.

What this means is the only way to make someone cease to exist via chrono murder is to kill their relative WHILE THEY ARE STILL in the current timeline.It means you have to kill the dude's mom while the dude in question is still in the present.If the dude is in the same time period as his mom well you cant get rid of him because once you kill his mom he becomes a time anomaly that poofed into existence from nowhere.

Get it?
Now this means if you were to shoot a random Homo Australothiphecus in Africa well you wouldnt cease to exist but if you tried travelling back to the present you may learn you killed over 300 million people from wiping out that one Austraphithecus.

In other words for backwards time travel DONT TOUCH ANYTHING.