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.


A) We detect this gas with x-ray telescopes.

Physics & Space Science

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What will be an ideal response?

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Water comes down the spillway of a dam from an initial vertical height of 170 m. What is the highest possible speed of the water at the end of the spillway?

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