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/sci/ - Science & Math

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3803044 No.3803044 [Reply] [Original]

If you lived on the edge of the Universe, would you be able to observe it?

Would all neighboring galaxies be all in one direction, with nothing existing on the other side?

Pic related

>> No.3803051

everything would look exactly like it was the second the universe started, assuming you travel at the speed the universe is expanding at so you are always on the edge

>> No.3803058

>>3803044
a sphere has no edge

>> No.3803063

>>3803044
The Universe has no edge. The observable universe has an edge, but you will never reach it because the observable universe is a sphere surrounding your present position.

>> No.3803071

>>3803058
>>3803064

ok then i'll rephrase it

The outside surface of a sphere

>> No.3803084

The universe is like Pac-Man. If you go as fast as you can in a single direction, you'll come hurtling back in the other side.

>> No.3803090

>>3803071

That's not how it works.

>> No.3803092

What is universe?

>> No.3803112

>>3803071
the universe IS the surface. If you are in the universe then you are ON the surface, you cannot be inside or outside.

>> No.3803127

I have a question.
If the universe is constantly expanding and neutrinos move faster than the speed of light, do we have neutrinos that have flown outside of the universe because they now move faster than the universe expands?

>> No.3803139

The edge of the universe is not a point in space, it's a point in time, the big bang.

>> No.3803152

>>3803139
so what you're saying is if I travel to the center of the universe, im going into the future?

>> No.3803173

>2011
>Still calling the multiverse "Universe".

>> No.3803176

>>3803127

Nice try, but the universe is expanding at a rate faster than the speed of light.

>> No.3803171

We only know about the known universe (a bunch of super clusters). We have no idea whats past them, there could be anything.

>> No.3803181

>>3803173
>...especially since there is no proof of a multiverse.

>> No.3803190

>>3803181
>yfw astronomers and physicists are looking for patterns in the CMBR that could indicate the presence of additional universes outside our own

>> No.3803208

>>3803152
if you're traveling through space, you're traveling through time

so, yes

>> No.3803218

So... you are saying that in at the edge of the universe, time stands still since the big bang ?

>> No.3803227

>>3803044
OP you seem to not understand the geometry of the big bang.

The universe can be thought of as the 3-dimensional surface of a 4-dimensional sphere that is blowing up in size. Since this is impossible to imagine, we can think of an analogue with one smaller dimension.

Imagine that instead of living in a 3D universe, we lived in a 2D universe on the surface of an expanding sphere. Any two points on the sphere will become further and further apart as the sphere gets bigger. Likewise in our universe, any two galaxies are moving away from each other. Everything is scattering away from everything else, and yet there is no "edge" or "center." Instead of the 2D to 3D analogy, you might think of it as the universe getting less dense over time, or space being added everywhere.

There actually sort of is an "edge." Since the universe is 13.7 billion years old, we cannot see anything more than 13.7 billion light-years away. In fact, since the early universe was so dense, there was fusion going on everywhere, until about 100,000 years after the big bang at which point the density was low enough for light to propagate. We see this as the Cosmic Microwave Background, the edge of the "visible" universe where we see the remnants of the early fusion.

http://en.wikipedia.org/wiki/Big_Bang
http://en.wikipedia.org/wiki/Cosmic_microwave_background_radiation

>> No.3803232

>>3803208
if you're a moving object in relation to another moving object or fixed frame of reference, you are not experiencing time, you're just moving.

You need to be an intelligent animal or a human to experience time.

>> No.3803240

>>3803227

Actually, due to expansion, we can see out 42 billion light years, the Hubble radius.

>> No.3803241

>>3803232
>You need to be an intelligent animal or a human to experience time.

This is false. One of the reasons we know special relativity is true is that certain cosmic rays are particles that should have decayed before reaching Earth. However, since they make the trip, we know they are experiencing time dilation.

>> No.3803266

>>3803227
Assuming the universe is a 4d sphere means that going in any one 3d direction will get you back to your starting point. Is there any indication that this is the case ?

>> No.3803264

>>3803240
This might technically be true, but isn't that relevant. Even if it is 42 billion light-years away from us now, it doesn't alter the fact that it was 13.7 billion light-years away when it left then. In any case, this is only a minor detail compared to the main point of my post: that OP's view of the geometry of the universe is very incorrect.

>> No.3803272

>>3803241
Motion dilation. Actually, "motion dilation" describes what's happening better than "time dilation".

>> No.3803275

>>3803266
Given cartesian coordinates, nope.

>> No.3803289

The big bang did not produce an infinite amount of matter. How could there not be an edge ?

>> No.3803290

>>3803266
technically yes, but because the universe is expanding faster than light you could never actually travel that distance.

>> No.3803296

>>3803289
how could there not be an edge of earth?

>> No.3803330

Questions...

1. What is the universe even expanding into?

2. If the universe is like a balloon, and getting bigger and bigger, where would we be on that balloon? On the outside? Or somewhere in its center?

3a: If on the inside - what's on the outside "edge"/"surface"? And how would we see the universe if were on the outside surface or however you want to call it?

3b: If we're on the outside already, like everything else is (this is what I'm getting from the thread here), then what's on the inside? In a balloon it's air or helium. What is the universe's air or helium?

I'm an ignorant idiot when it comes to these things, but these questions should have clear cut answers, right?

>> No.3803365

>>3803296
we live on the edge of earth, silly

>> No.3803375

>>3803365
He meant the edge of the surface of the Earth. There is no edge to the surface of a sphere because it is a 2D surface bent into a 3rd dimension. The universe has no edge because it is a 3D volume bent into a 4th dimension.

>> No.3803384

>>3803330
1. Nothing.
2. The analogy only pertains to the surface of the balloon. There is no center. The entire universe is analogous to just the surface. The analogy takes away one dimension to make it more comprehensible.
3. See answer 2.

>> No.3803482

>>3803330
> 1. What is the universe even expanding into?

Since we live in 3D and experience time, hence a 4D universe, then the minimum universe that we're expanding into is 5-dimensional.

This is true by implication. There is no way to confirm it, since our universe is a black hole and as such, we are stuck within it.

>> No.3803618
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3803618

If you lived on the edge of the Universe, would you be able to observe it?
Well how would you know it is the edge of the universe is you are not able to observe it?
And what is the "other side" like I said if you cant observe it the what is the edge.

>> No.3803657

>>3803289
the big bang produced matter out of nothing, might as well be an infinite amount of it

>> No.3803834

>>3803657
Actually, the Big Bang produced a great deal of both space and matter by using a very large but finite amount of energy, at least as I've come to understand the theory.

>> No.3803845

The "edge" of the universe is the Big Bang.

>> No.3803902

>>3803384

So if the universe is the surface of the balloon, what is inside of it?

>> No.3803920
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3803920

>The thread in which most of /sci/ thinks the universe is a bubble.

The observable universe is the part of the universe we can observe. It is defined by how far light could have traveled since the universe expanded (i.e. we can see as far away as how far light could have traveled since the universe began). The ENTIRE universe is another matter. We don't know the shape; it may not be closed. Talking about an edge is nonsense (at least that's my understanding of things)

>> No.3803933

>>3803920

Well if Light has a limit, does what lies outside of it really exist?

>> No.3803962

>>3803933

NIGGER ARE YOU SERIOUS


-WAIT-

IS THIS WHOLE THREAD SERIOUS?

WHAT ARE UNIVERSE? EDGE?