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Planet Blog!

A club blog for Poki's Astronomy club

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Planet Earth!

The Home world and birth place of Humanity!

Viewing category Dwarf Planets
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Dwarf Planets

Why is Pluto no longer defined as a Planet For a long time, we thought Pluto was unique in the Kuiper Belt. But as astronomers discovered more and more about the Kuiper Belt (and the asteroid belt between Mars and Jupiter), we learned that there are lots of objects like Pluto. More like Pluto, in some ways, than Pluto is like the other planets. Finding all these new objects, it became necessary for astronomers to get more specific about what we mean by the word "planet," and figure out which ca