What estimate for Milky Way stars informs the mass calculation for a large galaxy cluster?
Answer
2 x 10^11 stars
When comparing the mass scale between a star cluster and a galaxy cluster, astronomers often use the Milky Way as a reference for an average galaxy's stellar content. The text specifies that an average galaxy, similar to the Milky Way, contains roughly $2 imes 10^{11}$ stars. This figure is vital because by multiplying this by the number of galaxies found in a large cluster (which might host $10^3$ galaxies), scientists can estimate the stellar organization equivalent to $2 imes 10^{14}$ stars in that single galaxy cluster, not accounting for the additional mass contribution from dark matter and the intracluster medium.
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