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? Where did they go? And what made them come back?
That's when scientists discovered the Kuiper Belt and the Oort Cloud.
Reed this book and find out:
How many types of comets are there?
What formed the Kuiper Belt?
How big is the Kuiper Belt?
What is the Oort Cloud?
How big is the Oort Cloud?
How long does it take sunlight to reach the Oort Cloud?

Find out the answers to these questions and more and amaze your family and friends with these fun facts.
Ages 8 and up.
All measurements in American and metric.

Educational versions have CCSS activities.

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