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On this date in 1877, American astronomer Asaph Hall discovered Phobos, the larger of Mars' 2 moons. He discovered the other moon, Deimos, later that year.

United statesAsaph hallPhil stookeAngeline stickneyDavid mintonAndrew hesselbrockKen ramsleyPurdue universityJpl caltech university of arizonaBrown universityStickney craterAstrogeology science centerplanetary dataKevin gillAstronomer asaph hall discovered phobos moon of mars 1877