14 Fun Facts About the Kuiper Belt and the Oort Cloud by Jeannie Meekins
Series: 15-Minute Books · 14 Fun Facts.
Approx. 3,070 words.
Published on December 2, 2012 by
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.
That's when they discovered more!