interstellar
adj. C1 Advanced US //ˌɪntɝˈstɛɫɝ// UK //ˌɪntəstˈɛlɐ// in·ter·stel·lar
adj. describing the space between stars or travel that happens between them.
adj. situated or occurring between the stars of a galaxy. Often used in scientific contexts to describe the vast regions of space or the medium found there.
Scientists study interstellar dust to learn about how stars form.
The Voyager 1 spacecraft became the first human-made object to enter interstellar space in 2012.
Theoretical physics suggests that interstellar travel would require propulsion systems capable of reaching a significant fraction of the speed of light to bridge the gap between solar systems.
From inter- + stellar.
Usage
Typically used attributively before a noun.