Comets are snowballs of frozen gas and dust that move on highly elongated orbits around the sun, taking from a few years to many thousands of years to complete one circuit. The comet has a tail made up of gas and dust which blows out from it in the solar wind sent out by the sun. There are thousands of pieces of rock, called asteroids in orbit around the sun. Most of these asteroids are grouped together between Mars and Jupiter. These large groups of rocks are known as the asteroid belts.
Asteroids are bigger than meteors and are like small planets.
They are tiny pieces of dust called Meteors. When a comet flies in the path of the earth, dust from its burning tail falls toward earth. When these particles hit earth's atmosphere at very high speed they burn up. When lots of dust hits Earth atmosphere, it burn up and looks like lots of shooting stars. This is called a meteor shower.