The Lyman-alpha forest is 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
Home • About • Copyright © The Worlds of David Darling • Encyclopedia of Alternative Energy • Contact