Scientists at the Institute for Advanced Study in Princeton, New Jersey, discover a new trans-Neptune Object, 2017OF201, potentially discrediting 2016 theory of Planet Nine.

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If there were one, that Planet Nine would "nudge the closest part of 2017 OF201's trajectory inward until Neptune flung it out of the solar system." Because 2017 OF201 is there, that could be an ...

But Pluto turned out to be too tiny — it is smaller than the moon — and was demoted to dwarf planet status in 2006. There are now four other officially recognized dwarf planets, and Cheng ...

For Cheng, he still hopes that this huge planet is out there somewhere. "We're in an era when big telescopes can see almost to the edge of the universe," he said.

But a Planet Nine would nudge the closest part of 2017 OF201’s trajectory inward until Neptune flung it out of the solar system. That would happen pretty quickly, within about 100 million years.

Bad news, earthlings. Computer simulations of the solar system’s future reveal a new risk facing us all: The gravitational tug of a passing star could either cause another planet to smack into ...

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