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The observation that began the 19th and early 20th century fascination with Mars as a place for life was:1) the discovery of the Martian moons2) Schiaparelli's observations of what seemed to him long straight features on the red planet3) Percival Lowell's discovery of an entire network of artificial canals4) the Viking spacecraft mission and its close-up images5) the landing of Martian spacecraft in New Jersey in 1938
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