Meteors, Meteorites, Asteroids and Comets

An explanation on the differences between these heavenly bodies. 

Asteroids are usually made from space debris like rock, although some are comprised of nickel or iron.
Comets are essentially space’s equivalent to snowballs. Unlike the asteroids that are mostly found in inner part of the solar system, comets begin their life outside the solar system.
Meteors are mistakenly referred to as shooting stars, but they are actually comprised of dust grains or rocks. Sometimes they are big enough to make it to Earth, and are then known as meteorites.