By shaping the orbits of asteroids and comets, the planets have contributed to cosmic collisions most comets or asteroids sent our way since the end of the heavy bombardment are from the jovian planets
One of the smaller planets in the inner Solar System is an asteroid. Asteroids are stony, metallic, or ice worlds without an atmosphere, with sizes and forms ranging from 1-meter pebbles to a dwarf planet with a diameter of over 1000 km.
The majority of the one million or more known asteroids[1] are found in the main asteroid belt, 2 to 4 AU from the Sun, between the orbits of Mars and Jupiter. The three categories of asteroids that are typically recognized are C-type, M-type, and S-type.
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