Boston-born polymath Percival Lowell got into the planet-hunting game. It’s not clear if Lowell was the first person to use the phrase “Planet X,” but he certainly popularized it. Lowell calculated where Planet X should be,
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, based on observations of Uranus and Neptune. Thirteen years after Lowell died in 1916,
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, American astronomer Clyde Tombaugh picked up the torch,
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, using Lowell’s calculations as a guide. Tombaugh’s systematic observations led him to Pluto in 1930,
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, close to where Lowell predicted Planet X would be.
Pluto’s fall from grace started months after its discovery. Unlike the other eight planets,
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, which travel on flat,
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, circular orbits,
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, Pluto speeds through Neptune’s orbit along a stretched, cockeyed trajectory. The diminutive planet didn’t appear massive enough to push the outer planets around. Estimates for Pluto’s mass dwindled until astronomer James Christy discovered Charon, Pluto’s largest moon, in 1978. Christy used the moon’s motion to weigh Pluto and found that the outermost planet had only 0.2 percent of Earth’s mass. If something was tugging on Uranus and Neptune,
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, Pluto was much too small to be the culprit.
NASA’s Voyager 2 spacecraft settled the Planet X question — for a time. When the probe flew past Uranus and Neptune in the 1980s, it gave astronomers better data to revise the masses of the planets. The new data revealed that nothing was pulling on them. Tombaugh finding Pluto where Lowell’s calculations pointed was just a coincidence.
The search for Planet X quieted, never disappearing, but not taken seriously. Planet X became

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