流星群，也称流星雨，通常是慧星慧尾的尘埃或者从小行星上脱落的小块物质引起的。

Meteors, also called shooting stars, normally begin as bits of dust from the tails of comets or even small pieces chipped off asteroids.

youdao

重点叙述流星天文学的历史与现状；流星群的地面和空间观测；流星雨观测和理论辐射点；

Especially, the history and status of meteoroid astronomy, the ground-based and space observations of meteoroid streams, the observed and theoretical radiants about meteor showers;

youdao

重点叙述流星天文学的历史与现状；流星群的地面和空间观测；流星雨观测和理论辐射点；

Especially, the history and status of meteoroid astronomy, the ground-based and space observations of meteoroid streams, the observed and theoretical radiants about meteor showers;

youdao