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Which statement about the dark nebulae is true? (a) they can be penetrated only with shorter waves, such as uv and x-ray.(b) they can be penetrated only with longer wavelengths such as radio and infrared. (c) they block the vast majority of radio waves from our galaxy.(d) only one is known to exist.(e) hydrogen and helium are the chief absorbing and scattering agents.
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Which statement about the dark nebulae is true? (a) they can be penetrated only with shorter waves,...
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