Translation guide
A quasar is an extremely luminous active galactic nucleus, powered by a supermassive black hole. In Japanese, it is almost always referred to by the loanword クエーサー.
Referring to the celestial object known as a quasar
The standard Japanese term for quasar, a direct loanword from English. Used in all contexts, from scientific to popular media.
クエーサーは非常に明るい天体です。
Quasars are extremely bright celestial objects.
このクエーサーは地球から100億光年離れています。
This quasar is 10 billion light-years away from Earth.
A rare, literal translation meaning 'quasi-star'. Occasionally seen in older or very formal scientific texts, but クエーサー is overwhelmingly preferred.
Quasars are a type of active galactic nucleus.