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Exactly 10 times
Exactly 18 times
154 ÷ 18 = 8 remainder 10
10 x 18 = 180
100
can be estimated by comparing their apparent magnitudes. Since brightness decreases with the square of the distance from an observer, a star cluster with main sequence stars one hundredth as bright as the Hyades Cluster would be approximately ten times further away from Earth than the Hyades Cluster.
180,000
18 x 10
2.0*10^18
18
18
4688