How do we know that galaxy clusters contain a lot of mass in the form of hot gas that fills spaces between individual galaxies?
A) We detect this gas with X- ray telescopes.
B) We infer its existence by observing its gravitational effects on the galaxy motions.
C) The hot gas shows up as bright pink in visible- light photos of galaxy clusters.
D) We can observe the frictional effects of the hot gas in slowing the speeds of galaxies in the clusters.
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