noun
space physics
Academic field covering plasma physics, magnetospheres, cosmic rays, and related topics in space environments.
彼は大学で宇宙物理を専攻している。
He is majoring in space physics at university.
天体物理 (astrophysics) focuses on stars, galaxies, and cosmology, while 宇宙物理 (space physics) emphasizes the physics of the solar system and near-Earth space environment.
Compound of 宇宙 (space, universe) and 物理 (physics).