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The Question

(Submitted Apil 23, 2007)

How far away is the furthest known galaxy?

The Answer

The most distant galaxy known today is called IOK-1, with a redshift of 6.964 which puts it about 12.88 billion light years away from earth. Here is more information:

http://www.universetoday.com/2006/09/15/subaru-finds-the-most-distant-galaxy/

http://www.nature.com/nature/journal/v443/n7108/full/nature05104.html

A galaxy called Abell 1835 IR1916 was found in 2004 and was originally thought to be at redshift 10, or about 13.18 billion light years away, but subsequent attempts to confirm the observation did not see the same results.

Here is the original report:

http://www.universetoday.com/am/publish/record_furthest_galaxy_broken.html

And here is a recent paper that discusses the attempts to confirm the original observation:

http://arxiv.org/abs/astro-ph/0601181

Jay and Jeff
for Ask an Astrophysicist

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