8/20/2026
The Chart Room

On this day in space! Aug. 17, 1877: Asaph Hall Discovers the Martian moon Phobos

Filed by Dana Graviton
On this day in space! Aug. 17, 1877: Asaph Hall Discovers the Martian moon Phobos
On this day in space, Aug. 17, 1877: American astronomer Asaph Hall discovered Mars's moon Phobos.
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Dana Graviton
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On this day in space! Aug. 17, 1877: Asaph Hall Discovers the Martian moon Phobos — The Chart Room