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Ducksters
Ducksters: Astronomy for Kids: Comets and Meteors
Kids learn about comets and meteors in the science of astronomy including the coma and tail, meteorites, meteoroids, the Kuiper belt, and the Oort cloud.
NASA
Nasa Space Place: Asteroid or Meteor: What's the Difference?
Learn the difference between asteroids and comets, meteoroids and meteorites, and more!
Other
Who Dunnit to the Dinosaurs?
"One of the great mysteries in science is the extinction of the dinosaurs at the end of the Mesozoic Era some 65 million years ago. Who (or more likely what) caused it is unknown and a subject of great debate." Many theories are touched...