it might simply be they're not sure how that big a galaxy evolved that early in the universe. But perhaps search Astronomy Picture Of The Day for the Deep Field entries? that might give you some useful clues to follow
In case people don't know, this is the Hubble Ultra-Deep Field (http://en.wikipedia.org/wiki/Hubble_Ultra-Deep_Field), which is a follow-up to the 1995 Hubble Deep Field (http://en.wikipedia.org/wiki/Hubble_Deep_Field) (and for hipsters, there's also the lesser know Hubble Deep Field South (http://en.wikipedia.org/wiki/Hubble_Deep_Field_South)). Here's video (http://www.youtube.com/watch?v=oAVjF_7ensg) giving a bit of context on the HDF experiment, finishing with a nifty animation using the galaxies' redshifts to give you a short 3D flythrough.
However, my favourite image for making me feel incredibly insignificant and yet simultaneously amazingly unique is this one and its accompanying text (http://www.bigskyastroclub.org/pale_blue_dot.htm).
In short, science is awesome (http://www.youtube.com/watch?v=7ImvlS8PLIo#t=158).
Thanks; still can't find any reference to UDF 423 as any kind of unknown physics, unfortunately. RationalWiki thinks it's outright bogus, but with no rationale. Oddly enough Yahoo Answers (UK, at least) gives some rationale.
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(no subject)
Date: 2012-02-11 02:53 am (UTC)(no subject)
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Date: 2012-02-12 01:40 pm (UTC)http://en.wikipedia.org/wiki/UDF_423
(no subject)
Date: 2012-02-12 03:01 pm (UTC)(no subject)
Date: 2012-02-12 11:53 pm (UTC)However, my favourite image for making me feel incredibly insignificant and yet simultaneously amazingly unique is this one and its accompanying text (http://www.bigskyastroclub.org/pale_blue_dot.htm).
In short, science is awesome (http://www.youtube.com/watch?v=7ImvlS8PLIo#t=158).
(no subject)
Date: 2012-02-13 04:59 am (UTC)(no subject)
Date: 2012-02-13 10:15 pm (UTC)