A convincing explanation of why some lineages survived while others vanished is still lacking in the hypothesis of an asteroid impact as the cause of the end-cretaceous mass extinction.
Asteroid is one of the smallest planets in the inner Solar System. Asteroids are stony or metallic worlds without an atmosphere that can be as large as a dwarf planet with a diameter of more than 1000 km or as small as 1-meter pebbles.
The main asteroid belt, located 2 to 4 AU from the Sun and in between the orbits of Mars and Jupiter, contains the majority of the one million or more asteroids that are now known. C-type, M-type, and S-type asteroids are the three types that are generally identified.
These were given names and are commonly linked to silicaceous, metallic, and carbonaceous compositions, respectively. With a diameter of more than 1,000 kilometres (600 mi), the largest asteroid, Ceres, is classified as a dwarf planet.
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