Universe expansion theory bs?

Question

You cannot create matter. How is the universe expanding with endless boundaries? I think the big bang caused it to become huge, and now it's collapsing inward. The empty space has extremely low pressure so the universe material would wanna fill it up and therefore it is contracting.

Answer 1

You can think (although it sounds more like belief) whatever you want, but that doesn't make it so.

You should learn about Doppler effect and red shift of light and then maybe you could understand how it is known that the universe is expanding.

Answer 2

>Universe expansion theory bs?

On the contrary, it's not BS, it's scientific fact supported by actual observations.

>You cannot create matter.

You can if you have some energy to start with. Just reverse Einstein's matter/energy equation: m=E/c^2.

>How is the universe expanding with endless boundaries?

Just because it's expanding doesn't mean it has endless boundaries. As an analogy, try looking at a bowl as you fill it up with water. The area occupied by water is expanding, but that doesn't mean it is endless.

>I think the big bang caused it to become huge, and now it's collapsing inward.

Quite frankly, it doesn't matter what you think, because there are hundreds of scientists who KNOW, and can DEMONSTRATE, that the Universe is expanding.

>The empty space has extremely low pressure so the universe material would wanna fill it up

Seriously, dude, get a physics education. You need it.

Answer 3

Nope, you can't create matter. That doesn't mean that the matter that already exists isn't moving. Like someone else mentioned, the light from stuff that's moving away from us red-shifts. Pretty hard to argue that.
And who said the universe had endless boundaries? There are good arguments for a finite universe.
Anyway, yup, you've hit on another theory called the Big Crunch, which says that at some point (like stretching a rubber band) all the matter in the universe will begin to contract again.

Answer 4

If the empty space has low pressure, think of how low the pressure must be if you think there's nothing outside the universe.
Besides that though, gasses move from high pressure to low pressure. This is b/c of the constant collisions that cause them to eventually move to unpopulated areas. Space is already at such low pressure, that this hardly has an effect anymore. Plus gravity overcomes this and hold many gasses together in planets and stars.

Answer 5

Due to the red spectral shifts not only is the universe still expanding, it is accelerating. This may be due to the effects of "dark energy".