Question

What are intergalactic gases?​

Answer 1

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Intergalactic gas is so tenuous that it emits no light of its own. ... Instead astronomers study it indirectly by observing how it selectively absorbs the light coming from faraway sources known as quasars.

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Answer 2

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➺ University of Warsaw: The Milky Way in three dimensions. "If you look in any direction you find, on average, roughly the same number of galaxies and similar properties for the gas between galaxies, the so-called intergalactic gas.

➺ Intergalactic gas is so tenuous that it emits no light of its own. Instead astronomers study it indirectly by observing how it selectively absorbs the light coming from faraway sources known as quasars.

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