The interstellar medium (ISM) is the matter and radiation that exists in the space between the star systems in a galaxy. This matter includes gas in ionic, atomic, and molecular form, as well as dust …

Interstellar medium, region between the stars that contains vast, diffuse clouds of gases and minute solid particles. Such tenuous matter in the interstellar medium of the Milky Way system, in which the …

Interstellar space — the region between stars inside a galaxy — is home to clouds of gas and dust. This interstellar medium contains primordial leftovers from the formation of the galaxy, detritus from stars, …

The Interstellar Medium (ISM) is the material filling the space between the stars. It consists mainly of gas (99%) and dust (1%), mostly found in the form of clouds, or nebulae (plural of nebula).

Apr 2, 2025 · The interstellar medium (ISM) is the material that fills the space between the stars in all galaxies; it is a multi-phase medium in pressure equilibrium, with densities and temperatures …

Simply put, the interstellar medium is the material which fills the space between the stars. Many people imagine outer space to be a complete vacuum, devoid of any material.

Sep 16, 2025 · Our Milky Way galaxy is home to more than 100 billion stars that are often separated by trillions of miles. The spaces in between, called the interstellar medium, aren't empty –– they're …

May 19, 2025 · Interstellar space refers to the regions between stars. And the interstellar medium — or ISM — fills this space. At a galaxy’s outer bounds, the ISM merges into intergalactic medium. That’s …

Aug 20, 2025 · The interstellar medium (ISM) is the vast expanse of space between stars and galaxies that is filled with gas, dust, and cosmic rays. It is a crucial component of the universe, as it serves as …

Apr 26, 1999 · Although space is very empty and the stars in the Milky Way are very far apart, the space between the stars contains a very diffuse medium of gas and dust astronomers call the interstellar …