we can observe our galaxy has a mass of about 8 . 0 x 1 0 1
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we can observe our galaxy has a mass of about x solar masses. Let's say a star is orbiting on the edge of the galaxy at about x lightyears from the center of the Milky Way. What should the orbital period T of that star be in years?
use x kg for the mass of our svelte sun, Big G is x Nmkg and it is handy to remember that the speed of light is x ms and there are ~ x seconds in a year
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