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

question 35

Multiple Choice

If the rotational speed of the gas in the disk of a spiral galaxy is 200 km/s at a distance of 80,000 light-years from its center,then what is the mass enclosed within this radius?

• A) 7.5 billion M_\(\odot\)
• B) 18 billion M_\(\odot\)
• C) 70 billion M_\(\odot\)
• D) 230 billion M_\(\odot\)

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