Asaph Hall

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Noun1.Asaph Hall - United States astronomer who discovered Phobos and Deimos (the two satellites of Mars) (1829-1907)
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They were only detected in 1877 by American astronomer Asaph Hall using the recently commissioned 26-inch Clark refractor at the U.S.
Phobos was discovered by Asaph Hall on August 17, 1877 at the U.S.
15 For what two linked discoveries is US scientist Asaph Hall remembered?
1877 Astronomer Asaph Hall discovered Phobos and Deimos - the 'moons' of Mars.