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Percival Lowell (/ ˈ l oʊ əl /; March 13, 1855 – November 12, 1916) was an American businessman, author, mathematician, and astronomer who fueled speculation that there were canals on Mars, and furthered theories of a ninth planet within the Solar System.
David Peck Todd (March 19, 1855 — June 1, 1939) was an American astronomer. He produced a complete set of photographs of the 1882 transit of Venus.
Mars is the fourth planet from the Sun. The surface of Mars is orange-red because it is covered in iron (III) oxide dust, giving it the nickname " the Red Planet ". [21] [22] Mars is among the brightest objects in Earth's sky, and its high-contrast albedo features have made it a common subject for telescope viewing.
The geological history of Mars follows the physical evolution of Mars as substantiated by observations, indirect and direct measurements, and various inference techniques.
Colonization or settlement of Mars is the theoretical migration of humans to Mars and the establishment of long-term human presence on the planet. The prospect has garnered interest from public space agencies and private corporations and has been extensively explored in science fiction writing, film, and art.
Astronomers had been observing Mars for hundreds of years, always concluding that the planet was moonless. It was not until 1877, as Mars was nearing opposition—when it makes its closest approach to the Sun and is on the opposite side of our sky from the Sun, a great time for seeing Mars up close—that Asaph Hall finally spotted one.
L' Exposition universelle de 1855 est une manifestation de type foire internationale à but commercial et culturel qui eut lieu à Paris en 1855. C'est la première exposition universelle française (et la deuxième mondiale, la première étant l' Exposition universelle de 1851 de Londres ).
