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PostPosted: Sat Mar 22, 2008 2:35 pm
 


<strong>Title: </strong> <a href="/link.php?id=31511" target="_blank">Exploding star seen halfway across the universe</a> (click to view)

<strong>Category:</strong> <a href="/news/topic/9-science" target="_blank">Science</a>
<strong>Posted By: </strong> <a href="/modules.php?name=Your_Account&op=userinfo&username=Hyack" target="_blank">Hyack</a>
<strong>Date: </strong> 2008-03-21 17:14:57


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PostPosted: Sun Mar 23, 2008 10:51 am
 


Cuz they divided the distance light travelled into the universe and came up with 3.
Hence 50% or halfway.
(Remember light bends in space.)
:?


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PostPosted: Mon Mar 24, 2008 8:28 am
 


lily wrote:
How do they know it was halfway across?


'Redshift'. The further something is away from us, the faster it moves away, causing the light it emits to be 'shifted' toward the 'slow' (red) end of the spectrum. Seeing how far the light from a star has 'red shifted' is a pretty accurate measure of it's distance.


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PostPosted: Mon Mar 24, 2008 8:51 am
 


FIANALLY PROOF!!!!!!
You see!!! This is all the result of Global Warming!!!!!! :wink:


Last edited by ManifestDestiny on Mon Mar 24, 2008 8:52 am, edited 1 time in total.

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PostPosted: Mon Mar 24, 2008 8:51 am
 


We don't know if the universe is finite or infinite. They take the calculated age of the universe and the distance back in time where the event occurred and compre the two. The result was about half the age of the universe, thus halfway across.


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PostPosted: Mon Mar 24, 2008 8:56 am
 


"The aging star, in a previously unknown galaxy, exploded in a gamma ray burst 7.5 billion light years away."





So in essence this really happened 7.5 billion years ago. Thats cool. Someone correct me if I am wrong


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PostPosted: Mon Mar 24, 2008 8:59 am
 


lily wrote:
So we've determined the universe isn't really infinite?


The universe may be infinite, or it may be expanding as matter fills it. We just don't know.

We have measured the age (and size), given redshift, at about 13.7 billion years. What lies beyond that, we can't say.

If the Universe is infinite, there is the theory that other universes have existed and been present, somewhere - but they were so far away from us that their presence has not be detected.


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PostPosted: Mon Mar 24, 2008 9:01 am
 


ManifestDestiny wrote:
"The aging star, in a previously unknown galaxy, exploded in a gamma ray burst 7.5 billion light years away."





So in essence this really happened 7.5 billion years ago. Thats cool. Someone correct me if I am wrong


Quite correct. Since we see light from stars, and light travels at a (more or less :) )fixed speed, distance is also time.


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