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

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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