X-rays come from certain regions of the interstellar medium because gas molecules in those regions are at a very high density.

Name: X-rays come from certain regions of the interstellar medium because gas molecules in those regions are at a very high density.
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X-rays from the interstellar medium are primarily produced by high-energy processes, such as the heating of gas to millions of degrees by shock waves from supernovae, rather than from the density of gas molecules.

X-Rays Come from Certain Regions of the Interstellar Medium Because