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High School Electives
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Astronomy
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Galaxy Groups and Clusters
Grade Level
Astronomy
AST.233 Galaxy Groups and Clusters
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Which observation would be least useful by itself for estimating the total mass of a cluster?
A
The X-ray temperature of diffuse intracluster gas
B
The velocity dispersion of confirmed member galaxies
C
The weak-lensing distortion of many background galaxies
D
The apparent color of one bright foreground star near the cluster
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