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the names given to these floating rocks aren't based on their size, but rather where they are and how far they go if they impact a planet. An asteroid is just a rock lazily floating through space. A meteorite is an asteroid that managed to survive its impact with the atmosphere (called a meteoroid once it hits the atmosphere) long enough to hit the ground (it's name changes from meteoroid to meteorite upon impact).

Well you could always simplify it to him. Simply say that the dinosaurs went extinct because a space nuke hit the earth. This was a special nuke because it made the earth very dusty, so the dinosaurs can't breath and died.

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