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Travelling to the edge of the Universe, 4th Dimensional Time Travel 
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#1
Apr1814, 05:11 PM

P: 3

There is no edge of the Universe. Alright, I kinda realize this, I'm not a layman.
However, nobody addresses what would happen if you traveled far enough. There's only a limited amount of matter out there and going off the theory that the volume of our Universe is finite, there's 'an edge' somewhere. Maybe not one that is reachable in 3D space however.. Say you're an adventurer, and you cataloged every piece of matter in existence after traveling for trillions of light years in one single direction. My question: Would you eventually 'wraparound' back to your original location, like in a video game, like PacMan? Take the balloon model, imagine a 3d Balloon. On there is a 2D Plane. The 2D plane is the universe. We put circles with marker over it to represent galaxies and we inflate it. That's our Universe expanding from Dark Energy and yada yada (We all know this). Now we draw a straight line around the balloon. Though it's not a straight line to us, it is to the 2D inhabitants. In our 3D world, the line 'bends' across our 3D vector, where to the 2D inhabitants however, it's just a line going on and on in one direction. Now apply that to the 3D Universe. Assuming the Universe is just one big 4D hypersphere: Using the model, as we travel in a straight line journey across the Cosmos in one direction, we'd be 'bending' across this 4th Dimensional vector, which is Time correct? So if we keep traveling, the 4th coordinate vector would increase, than slowly decease back to our original vector location, which would mean our Time is getting distorted. Would we eventually return to our original location, and would it happen because the side effect of Time Travel has made it feasible? 


#2
Apr1814, 10:57 PM

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PF Gold
P: 9,372

The observable universe is always centered on the observer. No matter how far you travel, you are still at the center of your observable universe.



#3
Apr1814, 11:25 PM

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#4
Apr1914, 09:19 AM

P: 3

Travelling to the edge of the Universe, 4th Dimensional Time Travel



#5
Apr2214, 02:04 PM

P: 65

Its impossible to ever prove this one way or the other since the observable universe is expanding faster then c. Since its impossible travel faster then c we can never reach the limits of the universe even if we traveled for trillions of years.



#6
Apr2214, 07:46 PM

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P: 11,565

http://en.wikipedia.org/wiki/Hypersphere 


#7
Apr2914, 09:24 PM

P: 9

The fourth spatial dimension could for example be orthogonal, at right angles to, to all three of the dimensions we are so familiar with. All three, simultaneously...



#8
Apr3014, 10:18 PM

P: 3

..but the fourth 'spatial' dimension doesn't exist in our Universe correct?



#9
Apr3014, 10:19 PM

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#10
May114, 05:31 AM

Math
Emeritus
Sci Advisor
Thanks
PF Gold
P: 39,339

I puzzled by this. You say you are a professional physicists, yet you seem to be unable to answer fairly basic questions about physics.



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