Apart from the sun and the planets, the solar system also consists of celestial bodies such as meteors, comets and artificial satellites. A meteor is made up of debris. A meteor enters the Earth’s atmosphere at a very high speed. The friction with the atmosphere makes the meteor hot and it burns till it disintegrates. As it falls to the ground, it glows brightly. This is why it is called a shooting star. Some meteors reach the ground before they burn completely and evaporate. These are called meteorites. Asteroids are made of rubble and are found in the gap between the orbits of Jupiter and Mars. This gap is called the asteroid belt.
An asteroid does not have a tail. However, a comet is made up of a bright head and a long tail. A comet consists of rock, dust, water, ice and frozen gases. Comets, too, revolve around the sun periodically, but their period of revolution is larger as compared to that of planets. One of the most famous comets is Halley’s comet, named after the discoverer. Its period of revolution is 76 earth years. Artificial satellites are man-made and are launched from the earth. Artificial satellites are used for transmission of television and radio signals, telecommunication, weather forecasting and remote sensing.