The photographic proof was conclusive. What Percival had seen as canals proved, when seen through a bigger newer telescope, to be just an optical illusion, or maybe the blood vessels in the back of Percival's own eye. Percival had a nervous breakdown. And when he recovered he sought to re-establish his reputation. He took up the search for the the last great mystery in the night sky, the powerful conundrum of Planet X.
In 1930 Clyde Tombaugh found Planet X. And since he was being paid by Percival's endowment, and still using Percival's 12” Clark, Planet X was named using Percival Lowell's initials – PLuto. And isn't it amazing that Planet X became the official IX planet in the solar system? You don't often get to use Roman Numerals in a joke.
Ah, but things were about to get even more amazing. With the refinement of observations of the outer planets a number of new great mysteries appeared in the night sky, as they always do. The more you know the less you know, you know.
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