If the Rotational Speed of the Gas in the Disk $\odot$

question 5

Essay

If the rotational speed of the gas in the disk of a spiral galaxy is 100 km/s at a distance of 26,000 light-years from its center,then what is the mass enclosed within this radius? If the mass of luminous matter inside this radius is 5 billion M _$\odot$ then what fraction of the galaxy's mass is made of dark matter?

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