There are no absorption lines, just a single hue of brilliant red!
They weren't able to find the absorption line for NH.
If has a comparatively long lifetime, then the result will be a transparent window completely inside of the - absorption line.
The width of absorption lines may be determined by the spectrometer used to record it.
He saw a rainbow of colour, and may even have seen absorption lines.
Then, an absorption line at the given wavelength in a stellar spectrum shows that the element must be present.
A cut along the spectrum shows the absorption lines of atmospheric oxygen.
Each individual cloud leaves its fingerprint as an absorption line at a different position in the observed spectrum.
Those are absorption lines for oxygen and water, here, aren't they?
The spectral absorption lines of water and oxygen were coming from there.
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