MadSci Network: Astronomy

Subject: How far away is the 'edge of the universe'? (see below)

Date: Sun Jan 19 11:43:54 1997
Posted by: David Kubiak
Grade level: grad
School/Organization: No school entered.
City: Missouri City State/Province: Texas
Country: USA
Area of science: Astronomy
Message ID: 853695834.As
How far away is the 'edge of the universe'? (see below)
When I read of scientists discovering galaxies "on the edge of the 
universe", perhaps 15 billion light years away, I wonder if they are 
including the distance the object must have traveled in the time it 
took for the light to reach their telescopes.  Very distant objects are 
said to be receding from any other point in space at a higher rate than
closer objects.  If a galaxy is discovered 15 billion light years away 
today, the light left that galaxy 15 billion years ago while receding 
at a high rate.  Where is it today, really?  Twice as far away? 

Re:How far away is the 'edge of the universe'? (see below)

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