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Lyman-alpha forest




The appearance of many differentially redshifted Lyman-alpha absorption lines in a quasar's spectrum, caused by intervening primordial hydrogen clouds along the line of sight to the quasar. Scientists use the Lyman-alpha forest to trace how matter congregates on the scale of a few megaparsecs.


Related categories

   • INTERSTELLAR AND INTERPLANETARY MATTER
   • SPECTRA AND SPECTROSCOPY