Henrietta Swan Leavitt
(1868 - 1921)
![leavitt.gif (71347 bytes)](images/leavitt.gif)
Observed more than 2400 Cepheid variable stars in the Small Magellanic Cloud
![](6051b.jpg)
She discovered that more luminous Cepheids took more time to go through one
bright-dim-bright period.
SMC photo NOAO/AURA/NSF
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