The Online Library of Knowledge

Solar System

Comets and asteroids A-Z

Asteroid   A rocky body that orbits the Sun. Asteroids range in size from tiny specks to blocks about 1000 km (600 miles) in diameter. Most asteroids are made of rock, some are made of metal and some are made of rock and metal. They are sometimes referred to as planetoids or minor planets

© 2020 Q-files Ltd. All rights reserved. Switch to Mobile