intergalactic absorption

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The absorption of light in the space between galaxies. It is too weak to detect between our own Galaxy and its near neighbours. However, high-redshift (and hence distant) quasars frequently reveal many Lyman-α absorption lines at redshifts smaller than that of the parent quasar. This is the Lyman-α forest, which arises from absorption by intervening clouds in intergalactic space.

Subjects: Astronomy and Astrophysics.

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