What Effect Do Even Thin Clouds of Dust Have on Light

question 15

Multiple Choice

What effect do even thin clouds of dust have on light passing through them?

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

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