Astronomers are trying to take the measure of Planet Nine before the hypothesized world has even been discovered. Earlier this year, astronomers Konstantin Batygin and Mike Brown, both of whom are based at the California Institute of Technology in Pasadena, proposed that a large planet lurks undetected in the outer solar system, far beyond Pluto's orbit. These objects' orbits suggest that Planet Nine may be about 10 times more massive than Earth, and may circle the sun at an average distance of 600 astronomical units (AU) or so, Batygin and Brown said.
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