Question

What is the difference between interstellar and intergalactic? Which is larger?

Answer 1

Interstellar, the space between stars within a galaxy. (Usually: a few stars are loners.) Intergalactic, between galaxies, each of which has hundreds of millions of stars and solar systems. ... Intergalactic implies far, far more empty space than interstellar, which is contained within a single galaxy.

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Answer 2

Answer:

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