Astronomical observations of our Milky Way galaxy indicate that it has a mass of about 8.0 • 1011 solar masses. A star orbiting on the galaxy’s periphery is about 6.0 • 104 light years from its center.a) What should the orbital period of that star be in years? b) If its period is 6.0 • 107 years instead, what is the mass of the galaxy in solar masses? Such calculations are used to imply the existence of “dark matter” in the universe and have indicated, for example, the existence of very massive black holes at the centers of some galaxies.

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Answered: Astronomical observations of our Milky…

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter6: Uniform Circular Motion And Gravitation

Section: Chapter Questions

Problem 47PE: Astronomical observations of our Milky Way galaxy indicate that it has a mass of about 8.1011 solar...

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Astronomical observations of our Milky Way galaxy indicate that it has a mass of about 8.0 • 10¹¹ solar masses. A star orbiting on the galaxy’s periphery is about 6.0 • 10⁴ light years from its center.

a) What should the orbital period of that star be in years?

b) If its period is 6.0 • 10⁷ years instead, what is the mass of the galaxy in solar masses? Such calculations are used to imply the existence of “dark matter” in the universe and have indicated, for example, the existence of very massive black holes at the centers of some galaxies.

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