noun
radio galaxy
Technical term in astronomy for a galaxy that emits strong radio waves, often from an active galactic nucleus.
電波銀河は、中心の超大質量ブラックホールから強力な電波を放射している。
Radio galaxies emit powerful radio waves from the supermassive black hole at their center.
活動銀河 (active galaxy) is a broader category that includes radio galaxies, Seyfert galaxies, and quasars. 電波銀河 specifically refers to those with strong radio emission.
Compound of 電波 (radio wave) and 銀河 (galaxy), a direct translation of the English term 'radio galaxy'.