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Definition
Spectroscopy: A technique used by astronomers that allows them to determine the properties, such as composition, temperature, and motion through space, of celestial objects by analyzing the spectra of celestial objects. For example, because each atomic element absorbs and emits light in a unique set of wavelengths, the astronomer can sift through the spectrum of a star and determine what elements are present in the star's atmosphere. More »

Stargazing Tip
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Radio Programs
Displaying 1 to 5 (of 7 total) results | More results »
 Title  Air Date
Spinning Galaxies May 26, 2007
Tulse Hill October 20, 2006
Moon and Spica June 26, 2004
Newton's Optics June 24, 2004
Moon and Jupiter June 23, 2004

Note: Audio versions of our programs will be available the day after they air. Visit the transcript page to listen.

Image Gallery
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 Image
Cosmic Rainbows
Cosmic Rainbows

Frequently Asked Questions
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Other Resources

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