A meteor shower is a celestial event in which a number of meteors are observed to radiate, or originate, from various locations in the sky. While they can sometimes appear to come from one point, on occasion, they are sprinkled across the sky.

For an observer, they appear to be similar to an illuminated arrow darting across the sky for a few seconds. These meteors are caused by streams of cosmic debris called meteoroids entering the Earth’s atmosphere at extremely high speeds on parallel trajectories. Most meteors are smaller than a grain of sand, so almost all of them disintegrate and never hit the Earth’s surface.

Intense or unusual meteor showers are known as a meteor outburst or meteor storm. When they occur, they may produce greater than 1,000 meteors an hour. The picture is a meteor outburst or meteor storm.

The first documented great meteor storm in the modern era was the “Leonids” of November 1833 - named so, because they radiated from the constellation “Leo”. American Denison Olmsted (1791-1859) examined the event most accurately and reported his findings in January 1834 to the American Journal of Science and Arts.

More Info: en.m.wikipedia.org