On this day in 1877 – American astronomer Asaph Hall discovered Phobos(pictured), the larger of Mars's two moons, six days after discovering Deimos, the smaller one. 
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On this day in 1877 – American astronomer Asaph Hall discovered Phobos(pictured), the larger of Mars's two moons, six days after discovering Deimos, the smaller one. 
