The Density of Interstellar Dust Is Very Low, Yet It

question 74

Multiple Choice

The density of interstellar dust is very low, yet it still blocks starlight because:

• A)it is so cold it absorbs higher energy photons.
• B)there is 100 times more opaque gas than dust present in the ISM.
• C)the dust particles are about the same size as the light waves they absorb.
• D)the dust particles are irregular in shape.
• E)ice particles reflect all light back toward their stars, not toward us.

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