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A thin cool gas in front of a hot source produces dark lines known as:
AAbsorption lines
BAttraction lines
CAdjustment lines
DAttachment lines
Answer & Solution
Correct answer: A. Absorption lines
1. Atoms in the cloud remove certain wavelengths.
2. Those wavelengths appear as gaps in the rainbow.
3. They are absorption lines.
_Source: OpenStax Astronomy 2e, Chapter 5, Radiation and Spectra._
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