What would be the orbital period of a star in the outskirts of a spiral galaxy that has a diameter of 92$92$ thousand light years and a total mass of 1.34$1\mathrm{.}34$x10^12$1012$ MSun. We know that 1$1$ light year =9.46$=9\mathrm{.}46$x10^15$1015$ m and 1$1$ MSun =1.99$=1\mathrm{.}99$x10^30$1030$ kg is the Sun's mass. Give your answer in  ($($mega−$-$years or millions of years).$).$ 

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To find the orbital period of a star in the outskirts of a spiral galaxy we can use Keplers Third La... View the full answer