Download Gizmo Student Exploration Star Spectra Answer Key

Introduction: Late in the 19 th century, Harvard astronomer Edward Pickering wanted to sort and catalog thethousands of star spectra that had been collected by the Harvard Observatory. He hired several women to dothe work, paying them 25 cents a day. The most prominent of these women was Annie Jump Cannon, whodevised a classification system still used today.

8 Cepheid variable stars change their brightness in a regular cycle. Gas p ressure builds up, causing the stars to expand quickly. When the pressure is rele ased, the star contracts, and the intensity of some spectral lines may decrease.

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Introduction: Late in the 19thcentury, Harvard astronomer Edward Pickering wanted to sort and catalog thethousands of star spectra that had been collected by the Harvard Observatory. He hired several women to dothe work, paying them 25 cents a day. The most prominent of these women was Annie Jump Cannon, whodevised a classification system still used today.

6 Cepheid variable stars change their brightness in a regular cycle. Gas pressure builds up, causing the stars to expand quickly. When the pressure is released, the star contracts, and the intensity of some spectral lines may decrease.

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