asteroids.
The conjunbto asterioides constitute a large and heterogeneous, small stars, also called minor planets, irregularly shaped, which orbits around the Sun, most of whom are between the orbits of Mars and Jupiter in the so-called main belt. An asteroid is a small rocky body orbiting the Sun with a diameter of less than 1000 km.
The first asteroids were discovered by chance, when engaged in finding the missing planet by looking between the orbits of Mars and Jupiter. Only 10% of them have a considerable size, such as the greatest of all and the first to be discovered on January 1, 1801 in Palermo (Italy) is Ceres, which has a diameter of 1,020 km, and Vestas Pallas cpn an approximate diameter de540 km in 1845 discovered five asteroids. Ten years later, and forty asteroids were discovered. With the application of photographic techniques, around 1845, it was discovered 15 asteroids per year, twenty asteroids per year in 1910, forty per year in 1930 ...
The relative velocity reaching these asteroids in the main belt is 5 km / sec. The collisions, when they occur, violent and destructive. Asteroids are thought to have endured more robust than several successive cycles of destruction-reconstruction.
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