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Fraunhofer lines
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<p>The Fraunhofer lines are a set of <a href="/facts/Spectral_line/HuI4Bj5f">spectral absorption lines</a>. They are dark <a href="/facts/Absorption_line/HuI4Bj5f">absorption lines</a>, seen in the <a href="/facts/Optical_spectrum/frPBh8o5">optical spectrum</a> of the <a href="/facts/Sun/CadPCVHh">Sun</a>, and are formed when atoms in the <a href="/facts/Solar_atmosphere/CadPCVHh">solar atmosphere</a> absorb light being emitted by the <a href="/facts/Solar_photosphere/CadPCVHh">solar photosphere</a>. The lines are named after German physicist <a href="/facts/Joseph_von_Fraunhofer/1dWvIByM">Joseph von Fraunhofer</a>, who observed them in 1814. </p>