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If We Found a Star Cluster at the Edge of the Disk

Question 90

Multiple Choice

If we found a star cluster at the edge of the disk of the Milky Way at a distance of 10 kpc from the center, and it orbited with a velocity of 250 km/s, what would be the total mass enclosed within this radius?


A) 1.4 * 1011 MSUN
B) 7.2 * 1011 MSUN
C) 9.5* 1011 MSUN
D) 4.2 * 1012 MSUN
E) 8.0 *1012 MSUN

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