noun
galactic cosmic rays; GCR
Technical term in astronomy for high-energy particles originating outside the solar system.
銀河宇宙線は超新星爆発などで加速されると考えられている。
Galactic cosmic rays are thought to be accelerated by events such as supernova explosions.
Compound of 銀河 (ginga, 'galaxy') + 宇宙線 (uchūsen, 'cosmic rays').