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Asaph Hall III (October 15, 1829 – November 22, 1907) was an American astronomer who is best known for having discovered the two moons of Mars, Deimos and Phobos, in 1877. He determined the orbits of satellites of other planets and of double stars, the rotation of Saturn, and the mass of Mars.
- New-York Central College, McGrawville
- November 22, 1907 (aged 78), Annapolis, Maryland, US
- October 15, 1829, Goshen, Connecticut, US
- Discovery of the two moons of Mars
In 1907 the British naturalist Alfred Russel Wallace published the book Is Mars Habitable? that severely criticized Lowell's claims. Wallace's analysis showed that the surface of Mars was almost certainly much colder than Lowell had estimated, and that the atmospheric pressure was too low for liquid water to exist on the surface.
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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.
- 24.07 km/s, (86700 km/h; 53800 mph)
- 1.025957 d, 24ʰ 37ᵐ 22.7ˢ
- 241 m/s, (870 km/h; 540 mph)
Sep 28, 2015 · In 1907, Is Mars Habitable? by A.R. Wallace directly critiqued Lowell's book, "furnishing a quite natural explanation of features of the planet which have been termed 'non-natural' by Mr....
Mar 11, 2024 · Asaph Hall (born Oct. 15, 1829, Goshen, Conn., U.S.—died Nov. 22, 1907, Annapolis, Md.) was an American astronomer who discovered the two moons of Mars, Deimos and Phobos, in 1877 and calculated their orbits.
- The Editors of Encyclopaedia Britannica
Oct 1, 2015 · In 1907, The Times published as front-page news an assertion by Prof. Percival Lowell that he had discovered intelligent life on Mars.
This article was originally published with the title “ The Opposition of Mars in 1907 ” in Scientific American Magazine Vol. 95 No. 21 (November 1906), p. 383 doi:10.1038 ...
