Summary: The Hubble telescope has been used to look again in the area of the Hubble Deep Field and has found 7 new galaxies, one of which may be the most distant galaxy observed. We can tell by the redshift. (The further away a galaxy is, the faster it is moving away from us. Because it is moving so fast, the light gets shifted a measurable amount. Further away=greater redshift.)
SpaceTelescope.org: http://www.spacetelescope.org/news/heic1219/ (I know, a new source!)
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