Astronomers at the California Institute of Technology announced on Wednesday that they have found new evidence of a giant icy planet lurking in the darkness of our solar system far beyond the orbit of Pluto. They are calling it “Planet Nine.” Their paper, published in the Astronomical Journal, estimates the planet’s mass as five to 10 times that of the Earth. But the authors, astronomers Michael Brown and Konstantin Batygin, have not observed the planet directly.
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