What causes dark bands observed in a star's spectrum?

A. Black holes' accretion disks
B. Different chemical elements which absorb light as specific wavelengths
C. Radio signals from the big bang
D. Gamma ray bursts from main sequence stars
Asked Jun 01, 2011
Emission lines, probably B
Answered Jun 01, 2011
absorbtion of wavelengths emitted by the star by the chemicals in ti's outer layers.
Answered Dec 01, 2013

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