A Massive Hidden Planet May Be Lurking Beyond Neptune—This Caltech Scientist Thinks “Planet Nine” May Soon Be Confirmed

· Thedebrief · June 5, 2026, 6:22 p.m.
astronomy Breaking News astronomers astronomy research neptune astronomy solar system Planet Nine
Summary
Caltech scientists are on the verge of potentially confirming the existence of a ninth planet, referred to as "Planet Nine," which is believed to be hiding in the outer Solar System.
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