Asteroid
An asteroid is a small, solid object in our Solar System, orbiting the Sun. An asteroid is an example of a minor planet (or planetoid), which are much smaller than planets. Most asteroids are believed to be remnants of the protoplanetary disc which were not incorporated into planets during the system's formation. Some asteroids have moons. The vast majority of the asteroids are within the main asteroid belt, with elliptical orbits between those of Mars and Jupiter.
Related Topics:
Solar System - Sun - Minor planet - Planet - Protoplanetary disc - Moon - Asteroid belt - Elliptical - Mars - Jupiter
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