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canvas prints arcturus canvas prints star canvas prints spectrum canvas prints spectral lines canvas prints absorption lines canvas prints visible light canvas prints astrophysics canvas prints stellar physics canvas prints elements canvas prints alpha bootis canvas prints simulated canvas prints astronomy canvas prints cosmology canvas prints science canvas prints stellar canvas prints

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Spectrum of Arcturus. High resolution spectrum of light coming from the star Arcturus (alpha Bootis), a cool giant star of spectral Type K. The spectrum is populated by dark lines. These lines, known as Frauenhofer lines, are caused by the absorption of different wavelengths by elements in the star's atmosphere. Analysis of the position and strength of the lines tells us much about the star's composition. This image was made from data gathered by the Coude Feed telescope at Kitt Peak National Observatory, Arizona.

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