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A meteoroid is a sand- to boulder-sized particle of debris in the Solar System. The visible path of a meteoroid that enters Earth's (or another body's) atmosphere is called a meteor, or colloquially a shooting star or falling star. If a meteoroid reaches the ground and survives impact, then it is called a meteorite. Many meteors appearing seconds or minutes apart are called a meteor shower. The root word meteor comes from the Greek meteĊros, meaning "high in the air".

Thursday, 31 May 2012

What Is A Meteor?

A meteor is the visible path of a meteoroid that has entered the Earth's atmosphere. Meteors typically occur in the mesosphere, and most range in altitude from 75 km to 100 km. Millions of meteors occur in the Earth's atmosphere every day. Most meteoroids that cause meteors are about the size of a pebble.
The velocities of meteors result from the movement of the Earth around the Sun with about 30 km/s, the orbital speeds of meteoroids, and the gravitational attraction of the Earth.

Source : http://en.wikipedia.org/wiki/Meteoroid
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