To an Asteroid and Back
Asteroids All Around
Asteroids are space rocks, left over from when the solar system formed 4.5 billion years ago. They are some of the oldest objects in the solar system, so they are very interesting to scientists.
Asteroids can be a few feet (1 m) to hundreds of miles (500 km) across. They spin and travel around the sun in orbits, just like planets do. Most are found in
