A meteor shower is a celestial event where a number of meteors are observed to radiate from one point in the night sky. These meteors are caused by streams of cosmic debris called meteoroids entering Earth’s atmosphere at high speed on parallel paths. Most meteors are smaller than a grain of sand, so almost all disintegrate and never hit the Earth’s surface. Intense meteor showers are known or unusual outbursts of meteors and meteor storms, which can produce over 1000 meteors per hour.