Asked by Shirley

How does the mass of all the interstellar matter in our galaxy compare with the total mass of its stars?
Answered by drwls
If you include dark matter, which is poorly understood and invisible, and makes up about 90% of the total Milky Way's mass, there is more interstellar matter than stars within our galaxy.

However, the total mass of interstellar gas and dust is a few percent of the total mass of stars, according to what I can find by searching the web.
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