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By Scientific American
March 22, 2018
![[article image]](https://cacm.acm.org/system/assets/0003/0666/32218.sciam.planet_nine_concept.large.jpg?1521755033&1521755033 "Planet Nine concept")
It's been just over two years since Caltech astronomers Mike Brown and Konstantin Batygin made an explosive claim: Based on the orbital motion of objects in the Kuiper Belt—a region beyond Neptune that is home to Pluto and other icy bodies—there must be a very big something much farther out, hidden save for its subtle gravitational tugs on the rest of the solar system.
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