Planet X and Nibiru
A ninth planet on a long elliptical orbit, returning to wreck the solar system on a date that keeps moving. The claim has a traceable history: an infrared survey in 1983, a reading of Sumerian texts published in 1976, and a run of arrival dates that have all passed quietly. What was claimed, who claimed it, and what astronomers actually found.
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The 1983 Infrared Survey That Became Planet X
A Washington Post story in late 1983 reported an unidentified infrared source that might have been a planet. The detection was real. So was the follow-up work that identified it, and that is the part the retellings leave out.