Percival Lowell
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Percival Lowell was an American businessman, author, mathematician, and astronomer who fueled speculation that there were canals on Mars, and furthered theories of a ninth planet within the Solar Syst
Lowell in 1904
The special mission, before departing to the United States. Lowell is seated on the bottom right (1883).
Martian canals depicted by Percival Lowell
Percival Lowell in 1914, observing Venus in the daytime with the 24-inch (61 cm) Alvan Clark & Sons refracting telescope at Flagstaff, Arizona
Planets beyond Neptune
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Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit. The search began in the mid-19th century and continued at th
Percival Lowell
…was an American businessman, author, mathematician, and astronomer who fueled speculation that there were canals on Mars, and furthered theories of a ninth planet within the Solar System. He founded the Lowell Observatory in Flagstaff, Arizona, and formed the beginning of the effort that led to the discovery of…
Jacques Babinet, an early proponent of a trans-Neptunian planet
Clyde William Tombaugh
Discovery image of Charon