Dans les années 1800, des observatoires dotés de télescopes de plus en plus grands sont construits dans le monde entier. En 1877, Giovanni Virginio Schiaparelli (1835-1910), directeur de l’Observatoire de Brera à Milan, commence à cartographier et à nommer des zones de Mars. Il découvre alors les « mers » et les « continents »…
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