Astronomical observations of our Milky Way galaxy indicate that it has a mass of about 8.0 X 10 solar masses. A star orbiting near the galaxy's peripr (a) What should the orbital period (in y) of that star be? y (b) If its period is 6.1 x 10 years instead, what is the mass (in solar masses) of the galaxy? Such calculations are used to imply the existence of other matter, such as a very massive black hole at the center of the Milky Way solar masses

Astronomical observations of our Milky Way galaxy indicate that it has a mass of about 8.0 X 10 solar masses. A star orbiting near the galaxy's peripr (a) What should the orbital period (in y) of that star be? y (b) If its period is 6.1 x 10 years instead, what is the mass (in solar masses) of the galaxy? Such calculations are used to imply the existence of other matter, such as a very massive black hole at the center of the Milky Way solar masses