oh and for the sake of clearifying things:
Briefly, a meteoroid is piece of cosmic debris in the solar system. It becomes a meteor when it enters Earth's atmosphere and begins to glow brightly. It becomes a meteorite if it survives and hits the ground.
Asteroids are a relatively small, inactive body, composed of rock, carbon or metal, which is orbiting the Sun.
Comets are relatively small, sometimes active object, which is composed of dirt and ices. Comets are characterised by dust and gas tails when in proximity to the Sun. Far from the Sun it is difficult to distinguish an asteroid from a comet.
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