http://www.top-directory.net/science/space/asteroids/Best collection of website in the Internet. Best general, niche and regional Website - You can find all this here. </p><p>Asteroids, commonly known as minor planets or planetoids are basically objects that are composed of metallic and rocky materials that were left behind during the solar system formation. It is generally believed that these planetoids, which follow their course around the sun, are the remaining portions of a planet that got smashed in the past due to a major collision.</p><p> Interestingly, these astronomical objects vary in their sizes to a great extent. In fact, an asteroid can be of the size of a tiny pebble or can be one with an enormous diameter, like Ceres, which is also termed as a dwarf planet. It is noteworthy that as many as sixteen asteroids have a massive diameter of more than 240 kilometer. To name some of the most important asteroids would be to include Braille, Gaspra, Vesta, Annefrank, Castalia, Mathilde, Eros, Ida and Dactyl, Toutatis, Geographos and of course, Ceres, the asteroid that was discovered for the first time. </p><p> It is worth mentioning that the asteroid classification usually takes place on the basis of two factors, namely the characteristics of their reflectance spectrum and the noticeable traits of their orbits. In fact, it is stories and movies based on science fiction that have made asteroids so popular. So much so that asteroids play as significant a role in scientific discovery as in the world of fiction.</p><p>