Astronomical observations of our Milky Way galaxy indicate that it has a mass of about 8 ✕ 1011 solar masses. A star orbiting near the galaxy's periphery is 6.0 ✕ 104 light years from its center.(a)What should the orbital period (in y) of that star be? y(b)If its period is 6.9 ✕ 107 y instead, what is the mass (in solar masses) of the galaxy? 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. solar masses

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Answered: Astronomical observations of our Milky…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Astronomical observations of our Milky Way galaxy indicate that it has a mass of about 8 ✕ 10¹¹ solar masses. A star orbiting near the galaxy's periphery is 6.0 ✕ 10⁴ light years from its center.

(a)

What should the orbital period (in y) of that star be?

(b)

If its period is 6.9 ✕ 10⁷ y instead, what is the mass (in solar masses) of the galaxy? 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.

solar masses

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