Example image of eyePlorer eyePlorer map for 'Martian canal': Giovanni Schiaparelli Mars Opposition (planets) Planet Charles E. Burton Percival Lowell Edward Emerson Barnard Edward Walter Maunder Optical illusion Alfred Russel Wallace Spectroscopy E. M. Antoniadi Paris Observatory Impact crater Mariner 4 NASA Atmospheric pressure Celsius Pascal (unit) Magnetic field Van Allen radiation belt William Kenneth Hartmann Italian language Ambiguity Cognate (etymology) French language German language Romance languages Spanish language Angelo Secchi Syrtis Major Albedo feature Axial tilt Rotation period Dust storm Canal Panama Canal Suez Canal Charles Augustus Young William Henry Pickering Arequipa Region H. G. Wells The War of the Worlds Edison's Conquest of Mars Garrett P. Serviss George Griffith A Princess of Mars Barsoom Edgar Rice Burroughs Alexander Bogdanov