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- 1863-1941. US astronomer who, from 1896,
- worked at Harvard College Observatory and
- carried out revolutionary work on the
- classification of stars by examining their
- spectra. Her system, still used today, has
- spectra arranged according to temperature and
- runs from O through B, A, F, G, K, and M.
- O-type stars are the hottest, with surface
- temperatures of 35,000K. She also discovered
- over 300 variable stars and five novae.
-