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Who was Annie Jump Cannon?

A physicist known for her work with integrated circuits

An astronomer who categorized the spectra of over 225,000 stars

Annie Jump Cannon was a pioneering astronomer who significantly contributed to the field of stellar classification. She is best known for her innovative work in categorizing and classifying the spectra of over 225,000 stars using the Harvard Classification Scheme, which she developed with her colleagues at the Harvard College Observatory. Her system enabled astronomers to organize stars based on their temperature and spectral characteristics, which laid the groundwork for modern astrophysics. Cannon’s meticulous observations and classification work helped to increase our understanding of the composition and behavior of stars within our galaxy and beyond. This achievement underscores her importance in the history of astronomy and highlights why she is recognized as a key figure in the field.

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A chemist who researched carbon compounds

A mathematician who developed star charting techniques

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