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14 Fun Facts About the Kuiper Belt and Oort Cloud: Educational Version

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It was once thought that our solar system ended at Saturn. Then the first telescopes revealed Uranus and Neptune. Differences in the calculations of the gravity of these giants set off another search and Pluto was discovered.
Pluto was then thought to be the last planet of our solar system. Beyond it was empty space – until astronomers started looking at comets.
Huge balls of ice, zipping through the solar system, past the planets, around the sun and back out again. Where did they come from? ...