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More detail on the recent Hubble photo of the galaxies

“Astronomers are already identifying some curious trends. For example, about 30 galaxies here seem to have redshifts greater than 5, meaning we see them as they were when the universe was less than 9 percent of its present age, or less than 1.1 billion years after the Big Bang. But only three are candidates for having a redshift around 6 (cosmic age 900 million years). “Why is there such a huge drop in galaxy numbers at z = 6?” asks Benitez. For now, the answer remains elusive. “