reply to post by SamTGonzalez
Dear AsmTGonzalez,
S&F, an intriguing post to be sure, I will think about it. Peace.
Our universe is young and growing, page
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Topic started on 1-11-2012 @ 12:32 AM by SamTGonzalez
In an infinite universe, which has existed forever, we should not see darkness in the night sky.
Imagine a universe divided into shells, with stars of a single brightness distributed evenly.
If you look at a shell twice as far, each star is only a quarter as bright.
But there are four times as many stars.
So each shell is equally bright.
If you have an infinite number of shells, you end up with infinite brightness.
There are many other possible explanations which have been considered:
-There's too much dust to see the distant stars.
-The Universe has only a finite number of stars.
-The distribution of stars is not uniform. So, for example, there could be an infinity of stars,
but they hide behind one another so that only a finite angular area is subtended by them.
-The Universe is expanding, so distant stars are red-shifted into obscurity.
-The Universe is young. Distant light hasn't even reached us yet.
The big bang theory might solve this by the implied age of the universe.
We only see light emitted since the beginning of the universe.
This is a long time, but certainly not infinite, and not enough to make the night sky bright.
Imagine a universe divided into shells, with stars of a single brightness distributed evenly.
If you look at a shell twice as far, each star is only a quarter as bright.
But there are four times as many stars.
So each shell is equally bright.
If you have an infinite number of shells, you end up with infinite brightness.
There are many other possible explanations which have been considered:
-There's too much dust to see the distant stars.
-The Universe has only a finite number of stars.
-The distribution of stars is not uniform. So, for example, there could be an infinity of stars,
but they hide behind one another so that only a finite angular area is subtended by them.
-The Universe is expanding, so distant stars are red-shifted into obscurity.
-The Universe is young. Distant light hasn't even reached us yet.
The big bang theory might solve this by the implied age of the universe.
We only see light emitted since the beginning of the universe.
This is a long time, but certainly not infinite, and not enough to make the night sky bright.
reply posted on 1-11-2012 @ 01:00 AM by SamTGonzalez
reply to post by SpearMint
I think Stephen hawking is on to something about time and space warping and overlapping. Think about how huge the known universe is. We may be in some kind of warp in space-time. how do we not see billions of more stars? Maybe our sun is so bright to us that we can not perceive any light brighter than it?
I think Stephen hawking is on to something about time and space warping and overlapping. Think about how huge the known universe is. We may be in some kind of warp in space-time. how do we not see billions of more stars? Maybe our sun is so bright to us that we can not perceive any light brighter than it?
reply posted on 2-11-2012 @ 09:02 AM by adjensen
Originally posted by donniered
The universe is not infinite. It's round. Think about it. All start's with a bang.
Nope. Recent cosmological observations have shown that the universe's expansion is accelerating. If the universe was cyclical, it would have to either be decelerating, or accelerating in contraction. As that is not the case, we're not in for a "big crunch", but rather a "big rip." Which, were we around to see it, would be rather unpleasant, lol.
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