What did Lowell's meticulous mapping at Mount Wilson Observatory reportedly reveal about the Martian canals?
Answer
Thousands of intersecting lines meticulously mapped by the astronomer.
Percival Lowell dedicated significant observational efforts to confirming and mapping the supposed Martian waterways from his observatory established in 1905. He became convinced that the planet hosted an extensive, organized network of these artificial features. His meticulous work resulted in detailed maps that purported to show thousands of these linear features intersecting across the Martian surface. This comprehensive mapping effort, published in books, was instrumental in solidifying the public and scientific belief for a time that Mars supported an intelligent, organized society struggling with dwindling resources.

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