
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 2 · The heart of Pluto
artiteacher The heart of Pluto
My heart beats cold, heart beats cold, Yeah we're blowing winds through the dark!

artiteacher Pluto's mountains are made of rock-hard water ice floating on nitrogen.
Fun Fact
Pluto's giant heart: The heart-shaped glacier on Pluto, Sputnik Planitia, is so massive it is roughly the size of Texas and Oklahoma combined.
Glossary
glacier (noun)
A slowly moving mass or river of ice formed by the accumulation and compaction of snow. In 2015, the New Horizons spacecraft discovered a vast nitrogen glacier within Pluto's bright Tombaugh Regio.
A slowly moving mass or river of ice formed by the accumulation and compaction of snow. In 2015, the New Horizons spacecraft discovered a vast nitrogen glacier within Pluto's bright Tombaugh Regio.
Quiz
What substance forms the smooth, crater-free glacier Sputnik Planitia on Pluto?
Quiz
How long did it take the New Horizons spacecraft to reach Pluto after launching?
Quiz
In what year did NASA's New Horizons spacecraft make its historic flyby of Pluto?


