Have astronomers found Planet Nine?

Science textbooks may be in for another revision. Our solar system shrank from nine planets to eight after the International Astronomical Union demoted Pluto in 2006. But there may yet be another world lurking beyond Neptune — and astronomers may have just found it. In 2016, astronomers proposed that our solar system could harbor a stealthy ninth planet basedContinue reading “Have astronomers found Planet Nine?”
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