What is the Universe expanding into..

Do you think there was anything before the big bang?

  • I don't think there was anything before the Big Bang

    Votes: 56 12.5%

  • I think something existed before the Big Bang

    Votes: 200 44.7%

  • I don't think the big bang happened

    Votes: 54 12.1%

  • I think the universe is part of a mutiverse

    Votes: 201 45.0%
  • Total voters
    447
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#1,681
jan.didden said:
I don't think think is possible. 'Infinity' is by definition the size that is larger than all other possible sizes (or numbers, or whatever).
So if you have two infinities, either they are the same size and then there really is only one, or they are not the same size. In the latter case, one is larger than the other, and that other is thus by definition not infinity.

I think.

Jan
Click to expand...

Could a dimension be infinite? Or would infinity require a group of dimensions to exist?
ie time is infinite <<<>>>space is infinite.. 😕 are they the same infinity?

With time we seem to have an infinite which is not tangible.

The assumption is both time and space are infinite perhaps they aren't? But then where is the universe? (everywhere?)
Reminds me of the song your everywhere and nowhere baby..

If something is infinite then it can't theoretically be anywhere can it? (wherever you ask the question is part of itself)

The infinite something might not be the universe but as before like the layers of an onion after the last layer what comes next?
It seems there would have to be a final everything..

Regards
M. Gregg
 
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#1,682
Just a scary thought,

If something is infinite and is the only infinite then it can't exist somewhere can it? it can only exist within itself..(so does it exist?)
I'm beginning to wonder if you thought of the answer everything would vanish and the wave front would collapse LOL (vanished in a puff of logic)

Its obviously wrong..😀 :scratch1:

Regards
M.Gregg
 
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#1,684
jan.didden said:
So if you have two infinities, either they are the same size and then there really is only one,
or they are not the same size. In the latter case, one is larger than the other, and that other
is thus by definition not infinity
Click to expand...

There are denumerable infinities (countable, like the integers or rational numbers), and nondenumerable
infinities (not possible to count in a systematic way, like the set of real numbers). Georg Cantor discovered
that a nondenumerable infinity is "larger" than a denumerable infinity. No matter how you systematically
"count" a nondenumerable infinity, there are always numbers that you will miss, in fact an infinity of them.
See the "diagonalisation argument".
 
#1,685
M Gregg said:
Could a dimension be infinite? Or would infinity require a group of dimensions to exist?
ie time is infinite <<<>>>space is infinite.. 😕 are they the same infinity?

With time we seem to have an infinite which is not tangible.

The assumption is both time and space are infinite perhaps they aren't? But then where is the universe? (everywhere?)
Reminds me of the song your everywhere and nowhere baby..

If something is infinite then it can't theoretically be anywhere can it? (wherever you ask the question is part of itself)

The infinite something might not be the universe but as before like the layers of an onion after the last layer what comes next?
It seems there would have to be a final everything..

Regards
M. Gregg
Click to expand...

Well 'infinite' doesn't exist in itself - you either have 'infinite time', or 'infinite size' or 'infinite distance' etc. Saying that the universe is infinite generally implies to mean 'infinite size'.

So you can't very meaningful discuss issue of infinity unless you specify 'infinite what'.

Jan
 
#1,687
rayma said:
There are denumerable infinities (countable, like the integers or rational numbers), and nondenumerable
infinities (not possible to count in a systematic way, like the set of real numbers). Georg Cantor discovered
that a nondenumerable infinity is "larger" than a denumerable infinity. No matter how you systematically
"count" a nondenumerable infinity, there are always numbers that you will miss, in fact an infinity of them.
See the "diagonalisation argument".
Click to expand...

Yes, but these are sort of philosophical constructs for the sake of setting up a consistent framework of thinking. It does not mean that it is mirrored in reality (whatever THAT is).

Jan
 
#1,694
jan.didden said:
Could the universe be infinitely large but not infinitely old? Or vice versa?

I wonder.
Click to expand...

The problem seems to be..anything that has a start point like a singularity cannot be infinite. Like expansion cannot be infinite size.

Infinite and size are diametrically opposed..its either infinite or has size..It cannot by definition be both at the same time.

The observable universe seems to be finite...so something else beyond would have to be infinite..(no barrier, no size, no end, and no start)
Theoretically life also if it was eternal would have to be the same..(no barrier, no size, no end, and no start) and would not be part of a finite universe.

Regards
M. Gregg
 
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