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Also known as ISM, interstellar gas, interstellar matter, cosmic matter
matter and radiation in the space between the star systems in a galaxy
AI overview
The interstellar medium is the material and light that fills the space between stars within a galaxy, including gas, dust, and radiation. Understanding it matters because it plays a key role in how stars form, evolve, and interact with their surroundings across a galaxy.
AI-generated from the Wikipedia summary — may contain errors.