Cannon and Leavitt, US astronomers

Cannon and Leavitt, US astronomers

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Credit: EMILIO SEGRE VISUAL ARCHIVES/AMERICAN INSTITUTE OF PHYSICS/SCIENCE PHOTO LIBRARY

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Caption: Cannon and Leavitt, US astronomers. At left is Annie Jump Cannon (1863-1941). At right is Henrietta Swan Leavitt (1868-1921). Both were pioneers for women in science, part of a group hired by the director of the observatory. Cannon was responsible for the compilation of the Henry Draper Catalogue containing a quarter of a million stellar spectra, and also developed a new spectral classification. Leavitt did important work on variable stars, laying the groundwork for them to be used to determine the size and age of the universe. Both have lunar craters named in their honour. Photographed at Harvard College Observatory, USA.Restrictions:

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