'恒星' (hénɡ xīnɡ) literally means 'eternal star' — a compound noun where 恒 (hénɡ) means 'constant, unchanging, enduring' and 星 (xīnɡ) means 'star'. Unlike planets or comets, which move visibly against the background sky, stars appear fixed in position over human timescales, hence the 'eternal' connotation. In modern astronomy, 恒星 specifically refers to self-luminous celestial bodies that generate energy through nuclear fusion — like our Sun.

This term is used in scientific, educational, and general descriptive contexts, distinguishing true stars from other luminous objects such as planets (行星), satellites (卫星), or artificial satellites (人造卫星). It's neutral in register and appears in textbooks, documentaries, news reports about space discoveries, and casual conversation when discussing astronomy. While not colloquial in everyday small talk, it’s widely understood and frequently taught in Chinese science curricula.