Space Rocks Rock!
Comets are a mixture of ice and dust. Comets are sometimes called "dirty snowballs" because of what they are made of (ice and dust). The dust tail of a comet is, of course, made of dust particles. Comets are leftovers of the formation of the universe.
Meteors are streaks of light in the sky produced by the burning of a meteoroid in Earth's atmosphere. Meteors are also flashes of light and are most times called "shooting stars", but they are not stars. They glow in the night sky like stars because when they hit the Earth's atmosphere, the friction of the rock rubbing against the atmosphere causes heat and light, thus making it seem like it's actually on fire.
Asteroids are generally larger chunks of rock that come from the asteroid belt between Mars and Jupiter. Asteroids are metallic rocky bodies without atmosphere that orbit the Sun, but are too small to be classified as planets. Known asteroids can range in size from 1,000 km to the size of pebbles.