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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The intergalactic medium is the hot, X-ray emitting gas that permeates the space between galaxies. Thought to be driven by either starbursts or active galactic nuclei, these are streams of highly-charged particles (including metals) that are often seen blowing out of galaxies.

Hope it helps you.