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 Infinite universe expanding!?!

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ANGELSKY



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PostSubject: Infinite universe expanding!?!    Tue Aug 23, 2011 11:59 am

My question is how can universe be infinite and expanding? If it is expanding then there must be a point from which it is going outward! And if there is a point then it proves that universe is finite! And when we're talking about finity and infinity how can universe be finite or infinite? Finity means there's 'the end', so the end means there is 'nothing' behind it? How? And again infinity means there isn't 'the end'. I get that a number can be infinite, but how can space-time be infinite?
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PostSubject: Re: Infinite universe expanding!?!    Tue Aug 23, 2011 12:03 pm

http://scienceforums.com/topic/3275-is-the-universe-infinite/

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PostSubject: Re: Infinite universe expanding!?!    Tue Aug 23, 2011 12:05 pm

It is not expanding from a point, but from every point.

It is more like everything in the universe is moving apart though, rather than the universe "expanding".

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PostSubject: Re: Infinite universe expanding!?!    Tue Aug 23, 2011 12:14 pm

One analogy, that can confuse, is to think of the surface of a balloon: the surface has no center or edge but can expand - everything gets further away from everything else. The universe may be like that (but in 3 dimensions, rather than the 2 of the balloon surface). BUT it is important not to think about the inside or outside of the balloon; the analogy doesn't stretch that far (it will burst!).

Hmmm.... but that doesn't address the "infinite" bit because the surface of the balloon has a limited size.

OK. How about this. Think of an infinitely long ruler. Now, if the ruler stretches, the (inch, cm) marks on it will get further apart (but the ruler will still be infinitely long).
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PostSubject: Re: Infinite universe expanding!?!    Tue Aug 23, 2011 12:16 pm

lol, well there is the theory of the big rip Smile

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PostSubject: Re: Infinite universe expanding!?!    Tue Aug 23, 2011 12:17 pm

andy 'astrojunkie' wrote:
lol, well there is the theory of the big rip Smile

the what? Suspect Shocked
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PostSubject: Re: Infinite universe expanding!?!    Tue Aug 23, 2011 12:22 pm

the big rip, its a theory that space will continue to expand to the point where it will destroy itself, rip itself apart, ummm, think of the universe as a balloon like scopeman said, as time (air) passes in it, it expands, stretches, well like scopeman also said, it only has a limit, then at some point it will pop basically, but others suggest that it the expansion will stop. then slowly start to come back to a single point, which is the theory 'the big crunch'

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PostSubject: Re: Infinite universe expanding!?!    Tue Aug 23, 2011 12:24 pm

oh.. sounds messy Laughing Suspect affraid
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PostSubject: Re: Infinite universe expanding!?!    Tue Aug 23, 2011 12:27 pm

indeed lol but it wont be for billions of years yet, billions of years past the point that the stars stop emitting light and heat 'the big freeze' Smile

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PostSubject: Re: Infinite universe expanding!?!    Tue Aug 23, 2011 12:36 pm

also the universe is expanding with proof because light from galaxies billions oflight-years away is only visible in the near or far end of the red side spectrum, as the red wavelength is the longest it indicates that the space in which the galaxies light is travelling has been stretched Smile

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