What Happens to Light Passing Through Even Thin Clouds of Dust

question 56

Multiple Choice

What happens to light passing through even thin clouds of dust?

• A) Even a little can completely block all light, such as the Horsehead Nebula.
• B) It dims and reddens the light of all more distant stars.
• C) Its motion causes the light of stars beyond to twinkle.
• D) The light that passes through them is blueshifted due to the cloud's approach.
• E) Its motion causes all light to be redshifted as it passes through these clouds.

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