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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
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