fraunhofer-lines

Fraunhofer lines

noun Astronomy.
the dark lines of the solar spectrum.

Origin:
1830–40; named after J. von Fraunhofer

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Fraunhofer lines (German ˈfraunhoːfər)
 
pl n
a set of dark lines appearing in the continuous emission spectrum of the sun. It is caused by the absorption of light of certain wavelengths coming from the hotter region of the sun by elements in the cooler outer atmosphere
 
[named after J. von Fraunhofer (1787--1826), German physicist]

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