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The light of distant stars is affected by

  • A.The earth's atmosphere
  • B.Interstellar dust
  • C.Both (a) and (b)
  • D.None of the above

Answer: C

Starlight is dimmed and reddened by both the earth's atmosphere and interstellar dust. The atmosphere scatters and absorbs light on its way to the ground, and dust between the stars does the same over far greater distances - which is why telescopes are placed on mountains and in orbit.

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