Does the universe have momentum?

[firewolfsm]

My basic reason for coming across this question was that, considering the sameness of space and time, if the universe moves in a direction in time, it must also move in one direction in space. Unless motion in all directions in space is relevant, this implies a universe with momentum. There are many implications to this question. This calls for the law of conservation of momentum, and a big bang of big bangs, in a sense.

I often wonder why at all the system should cease to grow in scale at just one universe, just a collection of clusters of galaxies, and why the universe isn't part of a collection.

 

[wuliheron]

Universe means "all that exists" including space and time so the question is meaningless. Along the lines of asking what is north of the north pole. If you are asking about the visible universe then there is no way to answer the question because nothing can move faster then light.

 

[A5]

Universe means "all that exists" including space and time so the question is meaningless. Along the lines of asking what is north of the north pole. If you are asking about the visible universe then there is no way to answer the question because nothing can move faster then light.

This. For the question to have any meaning, you'd have to be in the reference frame of an observer outside of the universe, which is impossible.

 

[Puppies04]

considering the sameness of space and time

Hmm i can move in any direction i choose in space, last time i checked i can't do that with time. Please explain this "Sameness"....

 

[pw38]

Hmm i can move in any direction i choose in space, last time i checked i can't do that with time. Please explain this "Sameness"....

I think the semantics are being critiqued without reading into what was meant. You're bound by space time.

Gravity is the great equalizer, so to speak. it affects the flow of space time and I highly doubt the universe flows through space time at a universal constant, unless I am misunderstanding what you are saying.

 

[Anteaus]

Gravity is the great equalizer, so to speak. it affects the flow of space time and I highly doubt the universe flows through space time at a universal constant, unless I am misunderstanding what you are saying.

From a philosophical standpoint, I believe that our universe can't flow through space time, since space time as we know it exists "within" the universe and not "around" it. What I find interesting is that although the big bang is the mostly likely scenario of the creation of the universe give what we know, the math doesn't really support the expansion and subsequent collapse over time considering the finite material available so what mechanism keeps everything going in perpetuity?

It's irrational to think that something can come from nothing, but unfortunately it seems no matter how you slice it, that is the only explanation to what is. It's a mind f**k

 

[pw38]

Yes it is definitely a mind eff. I love to think about it though.

 

[at80eighty]

I have a question. If the universe is the entire containment of space, time and everything within - what is the space (using the term loosely) that it the universe itself is (ever) expanding in? Hope im making sense

 

[wuliheron]

I have a question. If the universe is the entire containment of space, time and everything within - what is the space (using the term loosely) that it the universe itself is (ever) expanding in? Hope im making sense

People used to believe the earth was flat and if you went far enough you'd fall off the edge. Similarly they used to believe if you went far enough you'd reach the edge of the universe. There is no edge to the universe and no matter what direction you point a telescope you can see back to the big bang. Einstein imagined it as a kind of 4 dimensional sphere where if you went far enough you'd come right back to where you started. The whole idea of "empty space" and "outside" the universe are oxymorons and the universe appears to be expanding because it creates space-time itself.

 

[at80eighty]

reading up on the 4-dimension sphere. that is awesome - I can visualise the contained expansion now. thanks

 

[pw38]

I have a question. If the universe is the entire containment of space, time and everything within - what is the space (using the term loosely) that it the universe itself is (ever) expanding in? Hope im making sense

Well, no one really knows what's beyond the "borders" of the Universe. Is there "space"? Is our universe creating space time as it expands? Are we just expanding at the contraction of another universe? What if Dark Matter and Energy are really just the result of a negative pressure from a collapsing universe outside of our own? Is there a universe outside our own? I think there almost certainly has to be for our physics to work. Perhaps our universe is just one atom in a nuclear chain reaction from an even greater explosion. What if the same is happening in every atom in the universe? The possibilities are mind blowing and that's what makes cosmology so fun.

 

[A5]

Is there a universe outside our own? I think there almost certainly has to be for our physics to work.

You're going to need to explain this, because I strongly disagree.

 

[ArisVer]

Space and Universe are very similar words and they consist of three dimensions.
Time is a one way street, maybe the fourth dimension, a different dimension.
Space and Time have no similarities.

If Universe moves it must be doing so in a different dimension irrelevant to time.
If Universe, by definition, is everything that exists, then it does not move.