Absorption Lines Due to Interstellar Gas

question 87

Multiple Choice

Absorption lines due to interstellar gas

• A) are wider than the lines from stars because the gas is hotter than most stars.
• B) are more narrow than the lines from stars because the gas has a lower pressure than stars.
• C) indicate that the interstellar medium contains dust.
• D) indicate that the interstellar medium is expanding away from the sun.
• E) none of the above.

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