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American astronomer Asaph Hall discovered Phobos, the larger of Mars's two moons, six days after discovering Deimos, the smaller one.
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Asaph Hall
American astronomer (1829–1907)
Asaph Hall III 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.Source: Wikipedia (CC BY-SA)
Phobos (moon)
Larger of the two moons of Mars
Phobos is the innermost and larger of the two natural satellites of Mars, the other being Deimos. The two moons were discovered in 1877 by American astronomer Asaph Hall. Phobos is named after the Greek god of fear and panic, who is the son of Ares (Mars) and twin brother of…Source: Wikipedia (CC BY-SA)
Moons of Mars
Natural satellites orbiting Mars
The two moons of Mars are Phobos and Deimos. They are irregular in shape. Both were discovered by American astronomer Asaph Hall in August 1877 and are named after the Greek mythological twin characters Phobos and Deimos who accompanied their father Ares into battle.Source: Wikipedia (CC BY-SA)
Deimos (moon)
Smallest and outer moon of Mars
Deimos is the smaller and outer of the two natural satellites of Mars, the other being Phobos. Deimos has a mean radius of 6.2 km (3.9 mi) and takes 30.3 hours to orbit Mars. Deimos is 23,460 km (14,580 mi) from Mars, much farther than Mars's other moon, Phobos. It is named…Source: Wikipedia (CC BY-SA)