彗星回归时,由于太阳辐射作用引起彗核内冰物质升华,使核内一些固体颗粒被夹带抛出到彗星周围,这些颗粒,起初以差不多与彗星相同的速度,聚在彗星周围,随同彗星运行。但由于被抛离彗核时的初速度有微小差异,以及各自的形状、大小各不相同,受行星际空间中各种因素的影响也不相同,这些颗粒在继续运行的长时间过程中,逐渐离开彗星,扩散开来,分布到彗星轨道的越来越长的弧段上,乃至分布到全轨道上,形成一股循环不断的颗粒流。当地球在绕日运行穿过这股颗粒流时,其中一部分颗粒会撞入地球大气层,与大气摩擦发光烧毁,成为流星。 At comeback, the ice sublimates in the nucleus due to solar radiation, causing some of the solid particles in the nucleus to be entrained around the comet. These particles, initially clustered around comets at about the same rate as comets, travel with comets . However, due to the slight velocity difference when they are thrown away from the nucleus, and their shapes and sizes are different, they are also affected by various factors in interplanetary space. During the long period of continuous operation of these particles, Gradually leave the comet, spread out, distributed to the comet orbit more and more long arc, and even distributed to the whole orbit, forming a continuous stream of particles flow. When the earth runs through the stream of particles during the winding day, some of the particles will crash into the Earth's atmosphere and rub against the atmosphere to burn out and become meteors.