Which of the Following Conditions Lead You to See an Absorption

question 55

Multiple Choice

Which of the following conditions lead you to see an absorption line spectrum from a cloud of gas in interstellar space?

• A) The cloud is cool and lies between you and a hot star.
• B) The cloud is extremely hot.
• C) The cloud is visible primarily because it reflects light from nearby stars.
• D) The cloud is cool and very dense, so that you cannot see any objects that lie behind it.

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