Which component of the Milky Way Galaxy accounts for interstellar extinction, the dimming of light from distant objects? A) cool hydrogen gas B) so-called hidden or missing matter, since its absorbing properties render it invisible in the Galaxy C) molecules such as H₂ and CO, which are strong absorbers, in molecular clouds D) dust

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Interstellar extinction is primarily caused by dust in the Milky Way Galaxy. This dust scatters and absorbs light from distant stars and other celestial objects, making them appear dimmer than they actually are.

Which Component of the Milky Way Galaxy Accounts for Interstellar