Large clouds of very hot gas that emit vast quantities of x rays are detected between the galaxies in rich clusters of galaxies. How has this gas been heated?
A) by the intense radiation from nearby galaxies
B) by the compression of gas as it falls into an unseen supermassive black hole between the galaxies
C) by the annihilation of antimatter in this region of space by matter ejected by nearby galaxies
D) by the collision of two galaxies
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