The universe was dark until the first stars began to form, but really lit up once massive hydrogen clouds began birthing galaxies of stars. A study by researchers using data from the South Pole Telescope finds that this period, the Epoch of Reionization, was later and more explosive than thought, ending 13 billion years ago. The clues come from minute temperature fluctuations in the cosmic microwave background radiation.
- Explosion of galaxy formation lit up early universeWed, 5 Sep 2012, 11:35:50 EDT
- Newborn stars discovered in dark cosmic cloudWed, 7 Jul 2010, 14:51:04 EDT
- Astronomers look to neighboring galaxy for star formation insightWed, 30 Nov 2011, 15:35:07 EST
- Wild 'teenage'-galaxies booming with star birthsTue, 12 Oct 2010, 10:06:26 EDT
- New stars from old gas surprise astronomersWed, 18 Feb 2009, 13:36:26 EST