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2015-10-22. Hubble spies Big Bang frontiers.

posted Nov 13, 2015, 10:09 AM by Alan Gould   [ updated Nov 13, 2015, 10:16 AM ]
NASA heic1523 — Science Release. For GSS A Changing Cosmos chapter 9. Excerpt: Observations by the NASA/ESA Hubble Space Telescope have taken advantage of gravitational lensing to reveal the largest sample of the faintest and earliest known galaxies in the Universe. Some of these galaxies formed just 600 million years after the Big Bang and are fainter than any other galaxy yet uncovered by Hubble. ...light from these galaxies took over 12 billion years to reach the telescope, allowing the astronomers to look back in time when the universe was still very young. ...Johan Richard from the Observatoire de Lyon, France, points out, “The faintest galaxies detected in these Hubble observations are fainter than any other yet uncovered in the deepest Hubble observations.” ...the team discovered that the accumulated light emitted by these galaxies could have played a major role in one of the most mysterious periods of the Universe’s early history — the epoch of reionisation. Reionisation started when the thick fog of hydrogen gas that cloaked the early Universe began to clear. Ultraviolet light was now able to travel over larger distances without being blocked and the Universe became transparent to ultraviolet light....  http://www.spacetelescope.org/news/heic1523/ See also: Hubble Uncovers Fading Cinders of Some of Our Galaxy's Earliest Homesteaders (2015 Nov 5; HubbleSite News Release Number: STScI-2015-38)