Chapter 1
The search for Planet X
Chapter 2
The heart of Pluto
Chapter 3
The weird worlds of the Kuiper Belt
Chapter 4
The great planet debate
Chapter 5
Beyond the icy frontier
YOUR GOAL
Master of Pluto and the icy worlds of the Kuiper Belt
Ch 5 · Beyond the icy frontier
artiteacher Pluto and Kuiper Belt
Beyond the icy frontier, a secret you'll find there! (Oh-oh!) Pluto's heart, Tombaugh Regio, moves its icy air! (Yeah!)
artiteacher A giant spherical shell of icy debris surrounds our entire solar system.
BETA
artiteacher Drag Pluto and its orbital buddies to discover how icy Kuiper Belt objects travel.
Fun Fact
Space snowman Arrokoth: The farthest object ever visited by a spacecraft, Arrokoth, looks exactly like a giant, reddish-colored snowman floating in space.
Glossary
oort cloud (noun)
A theoretical spherical shell of icy objects believed to surround the outer limits of the solar system. In 1950, Dutch astronomer Jan Oort proposed this region as the source of long-period comets.
A theoretical spherical shell of icy objects believed to surround the outer limits of the solar system. In 1950, Dutch astronomer Jan Oort proposed this region as the source of long-period comets.
Quiz
What nickname was given to the icy, snowman-shaped object Arrokoth visited in 2019?