Interstellar Absorption Lines Are Narrow Primarily Because

question 1

Multiple Choice

Interstellar absorption lines are narrow primarily because:

• A)there is very little interstellar matter.
• B)molecules always produce narrow absorption lines.
• C)most of the matter is ionized, and atoms moving fast produce sharp lines.
• D)the matter is at a low temperature, and atoms are almost still.
• E)All of the above are correct.

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