An absorption line in an electromagnetic spectrum, appearing as a black line at visible wavelengths.
- Look at the spectrum of light from a distant object and you will see characteristic bright and dark lines that appear similar to those from earthly material, except for one difference: the positions of the lines are shifted toward the red.
- These missing wavelengths are characterized by dark lines in the spectrum.
- In 1860 Bunsen and Kirchhoff observed dark lines in the spectrum of a light source passed though burning substances.
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