Hot, Low-Density Gas Can Be Detected in Galactic Clusters Through

question 54

Multiple Choice

Hot, low-density gas can be detected in galactic clusters through X-ray emission. The gas is important in understanding dark matter because ____.

• A) dark matter is responsible for heating the gas
• B) dark matter must make the cluster massive enough to hold on to the hot gas
• C) the gas may be the source of dark matter
• D) the gas is clumped in empty places between galaxies where there is more dark matter
• E) the gas is produced by dark matter

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