1893- Henrietta Swan Leavitt
Expansion of the Universe
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Women Inventors & Innovators – Map »Women Inventors & Innovators – Map
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1893- Henrietta Swan Leavitt
Astronomy »Astronomy
1890s to 1920s - Progressive Era  »1890s to 1920s - Progressive Era
DISCOVERING SECRETS OF THE UNIVERSE »DISCOVERING SECRETS OF THE UNIVERSE
1870s to 1900s - Industrial Era  »1870s to 1900s - Industrial Era
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