Astronomical observations (starlight): The light that we receive from very distant stars is affected primarily by what? Consider both near-Earth and interstellar influences on incoming starlight. Choose the correct combination.
General Knowledge
World Geography
Difficulty: Easy
Choose an option
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AThe Earth's atmosphere
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BInterstellar dust
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CBoth (a) and (b)
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DNone of the above
Answer
Correct Answer: Both (a) and (b)
Explanation
Given data
- Asks what modifies the light of distant stars before it reaches observers.
Concept/ApproachInterstellar dust causes extinction and reddening of starlight over vast distances. Near Earth, the atmosphere introduces seeing effects (scintillation/twinkling), absorption and scattering (especially at shorter wavelengths). Thus, both significantly affect the observed light.
Final AnswerBoth (a) and (b)