Interstellar (adjective)

1. Between or relating to the stars.
2. Occurring or existing between stars or within a galaxy.

Origin:

Late 19th century: from inter- "between" + stellar.

Examples:

1. Interstellar space is the vast, mostly empty region between stars.
2. The interstellar medium is the matter and radiation that exists in the space between stars.
3. The interstellar dust is composed of tiny particles that are found between stars.
4. Interstellar travel is the hypothetical propulsion of a spacecraft to the nearest star outside the Solar System.
5. The interstellar wind is a flow of gas and particles from one star to another.