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Evidence of controversial Planet 9 uncovered in sky surveys taken 23 years apart
If the object really is Planet Nine, it would be larger than Neptune and exist 700 times further from the sun than Earth.
"However, the follow-up observations with optical telescopes still need to cover about three square degrees because Planet Nine would have moved from the position where AKARI detected it in 2006. In 2021, astronomer Michael Rowan–Robinson of Imperial College, London, found an object in the IRAS data that had an estimated three to five Earth masses, and was much closer to the sun at about 225 AU. With the Nancy Grace Roman Space Telescope soon to launch to perform high-resolution deep surveys of the sky, and the Vera C. Rubin Observatory set to see first light this year, as well as the prowess of the already-established Dark Energy Camera, then if Planet Nine exists it is running out of places to hide.
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