What role do absorption lines play in spectroscopy when analyzing light from distant stars?
Answer
They function like a barcode, identifying the elements within a star atmosphere and showing how its light has been altered.
Spectroscopy is a technique used to analyze light from distant objects by looking at absorption lines. These lines appear as dark bands in the light spectrum because elements in the atmosphere of a star absorb specific frequencies of light. Just like a barcode provides specific information about a product, these lines provide critical data regarding the chemical composition of a star and reveal how the light has been changed, or shifted, by the time it travels across space to reach an observer on Earth.
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