Which Component of the Milky Way Galaxy Accounts for Interstellar

question 266

Multiple Choice

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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