Helge Stjernholm Kragh (born February 13, 1944) is a Danish historian of science who focuses on the development of 19th century physics, chemistry, and astronomy.
His published work includes biographies of Paul Dirac, Julius Thomsen and Ludvig Lorenz, and ''The Oxford Handbook of the History of Modern Cosmology'' (2019) which he co-edited with Malcolm Longair.
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