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Martian double canals Phison and Euphrates as observed on 18 November 1894. The American astronomer Percival Lowell (1855-1916) theorised that a Martian civilization, faced with climate change
Drawing of Mars showing canals and dark areas, 1896. The American astronomer Percival Lowell (1855-1916) theorised that a Martian civilization, faced with climate change
Drawings of Mars showing its canals and polar ice caps, 1907. These drawings are from observations made at the Lowell Observatory, Flagstaff, Arizona, USA, on 8-12 July, 1907