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Nemesis and the 26-Million-Year Clock

In 1984 two paleontologists counting fossil families found a rhythm in the extinction record: a beat arriving every 26 million years. Astronomers worked out what could keep time like that, named it Nemesis, and went looking. Forty years of infrared surveys have not turned it up. The beat has survived every attempt to explain it away, including a rewrite of the geological timescale underneath it.
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.