星系 xīngxì galaxy
How to remember 星系: 星 star + 系 system = galaxy.
Characters
How it is used
- A galaxy (astronomy) - 银河系 (yínhéxì) the Milky Way galaxy, 河外星系 (héwài xīngxì) galaxies beyond it.
- The technical term for a star system/galaxy. 系 read xì here (system).