Alvan Graham Clark sees Sirius B

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Testing a newly figured 18.5-inch refractor at Cambridgeport, Massachusetts, Clark resolved a faint companion beside Sirius - the object whose motion had already been inferred from the wobble of Sirius A. It was the first white dwarf ever seen, though nothing about it could be understood for another sixty years: a star of roughly solar mass in a body about the size of the Earth implied densities that classical physics had no way to support.

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