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Astronomers have observed a small,
massive object at the center of our Milky Way galaxy . A ring of material orbits this massive object; the ring has a diameter
of about 15 light-years and an orbital speed of about 200 km/s. (a) Determine the mass of the object at the center of the Milky Way
galaxy. Give your answer both in kilograms and in solar masses (one
solar mass is the mass of the sun). (b) Observations of stars, as well
as theories of the structure of stars, suggest that it is impossible for
a single star to have a mass of more than about 50 solar masses. Can
this massive object be a single, ordinary star? (c) Many astronomers
believe that the massive object at the center of the Milky Way galaxy
is a black hole. If so, what must the Schwarzschild radius of this black
hole be? Would a black hole of this size fit inside the earth’s orbit
around the sun?

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