- 外星人 wàixīngrén alienextraterrestrial; space alien; intelligent being from another planet
- 河外星系 héwàixīngxì extragalactic galaxyA massive system of stars, gas, and dust located outside of our own Milky Way, such as an elliptical, spiral, or irregular galaxy.
- 河外星云 héwàixīngyún extragalactic nebula