A metiorite. I believe what you're talking about is a meteoroid, not an asteroid. An asteroid is rather large, revolves around the sun, and when one hits the Earth, and a few have, it is disastrous. A meteoroid, on the other hand, is much smaller and when it hits the Earth's atmosphere and burns up (due to the friction of the atmosphere) it is called a meteor. After it reaches the Earth's surface, it is called a meteorite. http://dictionary.infoplease.com/meteor merci, have a good day.