Annie Jump Cannon

Helen Swayer Hogg and the Globular Clusters

Helen Swayer Hogg and the Globular Clusters

On August 1, 1905, American-Canadian astronomer Helen Sawyer Hogg was born. Hogg is noted for pioneering research into globular clusters (stars with cyclical changes of brightness found within huge, dense conglomerations of stars located in the outer halo of the Milky Way galaxy) and variable stars. She was the first female president of several astronomical organizations and a notable woman of science in a time when many universities would not award scientific…
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Annie Jump Cannon and the Catalogue of Stars

Annie Jump Cannon and the Catalogue of Stars

On December 11, 1863, American astronomer Annie Jump Cannon was born. Her cataloging work was instrumental in the development of contemporary stellar classification. With Edward C. Pickering, she is credited with the creation of the Harvard Classification Scheme, which was the first serious attempt to organize and classify stars based on their temperatures. “A life spent in the routine of science need not destroy the attractive human element of a woman’s nature.” —…
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