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Continuous, Absorption Line, and Emission Line Spectra
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Description
This schematic diagram summarizes how different types of spectra are produced. The prisms are added
for conceptual clarity, but in real telescopes, diffraction gratings are used to separate the colors. A hot, glowing
object emits a continuous spectrum. If this source of light is viewed through a cool gas, dark absorption lines
appear in the resulting spectrum. When the same gas is viewed against a cold, dark background, its spectrum
consists of just bright emission lines.
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