The same astronomer wrote extensively about canals on Mars and about the possibility of a ninth planet in our solar system. The observatory named after this astronomer is the:

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The astronomer in question is Percival Lowell, who believed that he had observed a network of canals on the surface of Mars and speculated about the existence of a ninth planet in our solar system. The Lowell Observatory in Flagstaff, Arizona was founded by Lowell in 1894 and named after him.

The Same Astronomer Wrote Extensively About Canals on Mars and About