The Sun revolves around the center of the Milky Way Galaxy(Fig. 5–49) at a distance of about 30,000 light-years fromthe center (1 ly = 9.5 × 1015 m). If it takes about 200 mil-lion years to make one revolution, estimate the mass of ourGalaxy. Assume that the mass distribution of our Galaxyis concentrated mostly in a central uniform sphere. If all thestars had about the mass of our Sun (2 × 1030 kg), howmany stars would there be in our Galaxy?Sun- 30,000 ly-FIGURE 5-49 Edge-on view of our galaxy.Problem 84.

The speed of the sun revolving around the galactic centre can be determined as, Here T is the time…

Answered: The Sun revolves around the center of…

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