How Do Absorption Lines from Interstellar Gas Compare to Absorption

question 101

Multiple Choice

How do absorption lines from interstellar gas compare to absorption lines from stars?

• A)They are wider than the lines from stars because the gas is hotter than most stars.
• B)They are narrower than the lines from stars because the gas has a lower pressure than stars.
• C)They indicate that the interstellar medium contains different elements than stars do.
• D)They indicate that interstellar medium clouds have high velocities.

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