However, it makes up approximately a third of the mass of the asteroid belt. [Gallery: Asteroid Pictures] Other asteroids are piles of rubble held together by gravity.

Solar System Exploration NASA Science Asteroids are rocky, airless Tens of thousands of these planets are gathered in the main asteroid belt,

What is the asteroid belt? The vast majority of asteroids in the solar system are found in a region of the solar system out beyond Mars. They form the Asteroid Belt.

Browse Asteroid Belt pictures, photos, images, GIFs, and videos on Photobucket

The asteroid belt is the circumstellar disc in the Solar System located roughly between the orbits of the planets Mars and Jupiter.

Photos: Asteroids in Deep Space. By SPACE.com Staff This Hubble Space Telescope image of Vesta shows another of the most massive asteroids in the asteroid belt,

Tens of thousands of these planets are gathered in the main asteroid belt, a vast doughnut-shaped ring between the orbits of Mars and Jupiter.

Learn about the Asteroid Belt. Information and facts about the area between Mars and Jupiter, did an asteroid kill off the dinosaurs and what are the modern day

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NSSDCA Photo Gallery: Asteroids – A collection of images of asteroids in our solar system