Which Statement About Dark Dust Clouds Is True

question 73

Multiple Choice

Which statement about dark dust clouds is true?

• A) They block the vast majority of radio waves from our Galaxy.
• B) They can be penetrated only with shorter waves, such as UV and X- ray.
• C) Hydrogen and helium are the chief absorbing and scattering agents.
• D) They comprise the majority of the mass of the Galaxy.
• E) They can be penetrated only with longer wavelengths such as radio and infrared.

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