9B. DWARF PLANET (KUIPER BELT) – PLUTO

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Pluto was the ninth planet in our solar system for 76 years. In 2006 it was reclassified a dwarf planet. It is the first object humans discovered in the Kuiper belt – kind of like a bigger version of the asteroid belt that lies beyond Neptune.
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In 2015 the first human spacecraft visited Pluto and took a gazillion pictures. In this one we see Pluto’s blue haze which is the product of sunlight shining onto methane molecules.
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Pluto’s really small. It’s smaller than Earth’s moon. Still it has five moons of its own. This is Charon – the biggest one.
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This is part of Pluto’s “heart” called the Sputnik Planitia. It’s made of nitrogen ice and is about the size of Hudson Bay.
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These are some of the mountains on Pluto. They’re as tall as many of Earth’s mountains.