Chapter 1
The search for Planet X
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Chapter 2
The heart of Pluto
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Chapter 3
The weird worlds of the Kuiper Belt
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Chapter 4
The great planet debate
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Chapter 5
Beyond the icy frontier
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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!)
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?