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Mars moon Phobos discovered

Mars moon Phobos discovered

18 August, 1877

Phobos, the Mars natural satellite, was discovered by American astronomer Asaph Hall on 18th August 1877. He had also discovered the other Mars moon, Deimos, a few days back – on the 12th of August. Hall was a professor at the United States Naval Observatory and had used their 26-inch (66-cm) telescope, the largest refracting telescope in the world at the time.

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