A new search for the elusive Planet Nine has once again yielded nary a sniff of a sneaky outer Solar System body.
Although the hypothetical object continues to evade detection, a six-year search in millimeter wavelengths has allowed astronomers to rule out an object with Planet Nine's predicted properties in a large swathe of the southern sky.The search also yielded some candidate objects that might be interesting to follow up in future surveys.
Planet Nine is one of the more intriguing Solar System propositions in recent years. For decades, scientists have speculated about the existence of a hidden planet in the far reaches of the Solar System, but it reached awith the publication of a paper by astronomers Mike Brown and Konstantin Batygin of Caltech.
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