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/sci/ - Science & Math

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1497448 No.1497448 [Reply] [Original]

Is the universe really expanding, or is it only the region we are in that is expanding?

>> No.1497449

Everything be expanding mang

>> No.1497450

>>1497448
It's all growing dude.

And what the hell would make our region expand and nothing else expand?

>> No.1497452

>>1497448
Try expanding only the middle of a balloon

>> No.1497453

>>1497448
>the region we are in

What? How are we in.. some ominous region of what's understood as everything, literally?
I mean, I'm not saying it's impossible for other things to exist beyond all the galaxies we can see, but if there were regions, and we were in one, and it was the only one expanding, then scientists would SAY that. They wouldn't say, "the universe is expanding", they would say, "region x is expanding".

What kind of question is this?

>> No.1497459

>>1497448

it's a proven fact that the universe is expanding simply through the physics of light, distant galaxies are tinged with red meaning they are moving away, if they where blue they would be coming to us. if they where yellow or white they would be stationary.

>> No.1497460

>>1497452
I think you can do that with mixed matter. Like blowing a bubble in a bubble.

>> No.1497488

>>1497460

so.. your response was expanding something inside of something already expanding? the only way 1 area could expand more then another is if there was a blockage of some sort (dark matter & gravity) preventing it from expanding normally, sort of like a balloon, you can squeeze areas to make it misshapen, but thats about all you could do is misshape it.

>> No.1497494

>>1497450
>And what the hell would make our region expand and nothing else expand?
I'm not saying that nothing else is expanding, but more like, our region is only expanding at a certain rate, while other regions outside of it are expanding at different rates as well. So everything isn't expanding at the same rate as everything else.

>> No.1497501

all expanding, but some parts are expanding faster than others

>> No.1497498

>>1497448

Dark flow not withstanding, the Universe appears to be expanding.
But with Brent Tully check, that the voids are growing like heck.

http://www.ifa.hawaii.edu/~tully/

>> No.1497506

>>1497494
OP here. Sorry, I should of written the post more like this.

>> No.1497511

>>1497501
Thanks. So it's not entirely one fixed expansion rate?

>> No.1497513

>>1497460
Blowing a bubble in a bubble won't change anything. Think about the amount of mass inside the larger bubble., it would be pushed.

What get's most people in this logic is that they always think of it in terms of air. Instead, think of a giant ass baloon full of steel. Yes, steel, in the shape of a baloon, and its completely solid. Now put a smaller one in there, which is also full. Can you add any more steel, either to the outside of the bigger bubble, or the inside of the smaller one? No.

>> No.1497515

>>1497511

>>1497513 here,
No. Galaxies toward the edges of the universe are moving faster than things toward the center.

>> No.1497522

>>1497513
If the densities of the gases in the larger bubble were weaker than the gases filling and forming in the smaller inside bubble, wouldn't the smaller bubble expand at its own unique rate, leaving the larger bubble unchanged?

>> No.1497534
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1497534

Beyond the visible limit the universe may have different characteristics/densities that could explain the Dark Flow.
Likewise our region may have unique features, such as the Great Void (some 1000x bigger than regular voids), suggesting a lower density.higher expansion rate than other places.

>> No.1497540

>>1497522
Sort of. They will always increase, as adding mass is adding mass, the question is: by how much?

Perhaps it's so small that you don't see an increase physically, but of course, it's still happening.

In retrospect, you really shouldn't see the universe as a big balloon, since it is not enclosed by any means. Well, obviously that's not proven or anything, but I don't think theres this giant wall at the edge keeping everything enclosed either.

>> No.1497565

The trouble is that there doesn't seem to be enough mass to explain the observed speeds of dwarf galaxies falling out places like the local void. There's not enough gravity...leading to the conclusion that voids 'push'. They may be expanding faster than space in which galaxies like ours sit. Think of a balloon with elastic bands wrapped around it...it will bulge more and more as it's inflated.