space physics
Academic field covering plasma physics, magnetospheres, cosmic rays, and related topics in space environments.
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).