Stellar physics was the field of physics which studied stellar phenomenon within a star. It was distinguished from quantum physics and astrophysics, in the sense that the former studied subatomic particles and the latter studied whole star systems at a time. One studying stellar physics was called a stellar physicist.(TNG: "Suspicions")

In 2369, when Wesley Crusher was modifying the planetary scanners, Geordi La Forge instructed him to leave enough data lines open for stellar physics. (TNG: "The Game")