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Astronomy and Astrophysics

'Pluto killer' calls on other astronomers to help find a ninth planet

'Pluto killer' calls on other astronomers to help find a ninth planet

The scientists who brought you "Planet Nine" want you — and your giant fancy telescope — to help catch the mysterious world in action.

This week, two Caltech scientists announced that an unseen giant planet some 10 times the mass of Earth may lie beyond the Kuiper belt, the icy ring of debris where dwarf planet Pluto resides. If true, it would become the first planet found in more than 150 years, since Neptune was discovered in 1846.

“If this planet is out there, it’s really a big deal,” said Gregory Laughlin, an astronomer at UC Santa Cruz who was not involved in the...

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