crash course astreroids

what are these so-called asteroids there really isn't a good definition for them but technically they are cracked disrupted because of being smashed into by other asteroids and maybe a few planets asteroids are usually well not usually hundred meters across but they can get pretty big some of the bigger ones have moons yes like the moon that orbits around our earth Cleopatra I think has 2 moons it is very dog-shaped siris was the first asteroid to be found and it is rocky on the outside and a huge sea of water under that with ice 

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