Absorption Lines Produced by the Interstellar Medium Indicate That Some

question 16

Multiple Choice

Absorption lines produced by the interstellar medium indicate that some components of the interstellar medium are cold and of a very low density because

• A) the lines are blue shifted.
• B) the lines are red shifted.
• C) the lines are extremely broad.
• D) the lines are extremely narrow.
• E) the lines are much darker than the stellar lines.