Shooting stars occur especially when the Earth in its orbit passes through a pile of debris of small rocky particles. Such 'heaps' are present near the orbits of comets because, after all, the coma of the comets partly consists of dust, and thus leaves behind a kind of 'dust-track'. The comet Swift-Tuttle leaves a trail of meteor showers known as Perseids, and when the Earth crosses this track we can see the meteors. At this time, up to 110 shooting stars can be seen every hour. Another such meteor shower takes place in November, when the Earth passes through the fragments of the comet Temple-Tuttle. This shower is known as Leonides.
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