A theorized huge, ninth planet beyond the orbit of Neptune once again wasn't found in a new survey of the solar system's outer reaches.
Astronomers scanned a large portion of the sky using the 6-meter Atacama Cosmology Telescope (ACT) in Chile to search for Planet 9. The quest came up empty, according to the scientists behind the research, although they acknowledged that more sensitive searches would make the result more definitive.
"Their search found many tentative candidate sources — about 3,500 of them — but none could be confirmed, and there were no statistically significant detections," the Harvard-Smithsonian Center for Astrophysics, a participating institution in the research, said in a release March 11.
Read more: https://www.space.com/planet-9-search-e ... ter-survey
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