we can observe our galaxy has a mass of about $8\mathrm{.}0$ x $1011$ solar masses. Let's say a star is orbiting on the edge of the galaxy at about $5\mathrm{.}26$ x $104$ light$-$years from the center of the Milky Way. What should the orbital period T of that star be in years?

$($use $1\mathrm{.}99$ x $1030$ kg for the mass of our svelte sun, Big G is $6\mathrm{.}674$ x $10-11$ N$*$m$2/$kg$2$ and it is handy to remember that the speed of light is $3\mathrm{.}00$ x $108$ m$/$s and there are ~$3\mathrm{.}16$ x $107$ seconds in a year$)$

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To find the orbital period T of the star on the edge of our galaxy we can use Keplers Third Law of P... View the full answer