Asteroids are small, airless rocky worlds revolving around the sun that are too small to be called planets. They are also known as planetoids or minor planets. In total, the mass of all the asteroids is less than that of Earth's moon.
What is an Asteroid?
Number of Asteroids
Sights of Asteroids
First asteroid image
Three more images followed
Karl Ludwig Hencke
3 step in asteroid discovery process 1/2
3 steps of the asteroids discovery process 2/2
Near Earth Asteroids
The Lincoln Near-Earth Asteroid Research (LINEAR) team
The Near-Earth Asteroid Tracking (NEAT) team
The Lowell Observatory Near-Earth-Object Search (LONEOS) team