Q$8.$ The average distance between the Sun and Earth is $r_{\text{s}\text{u}\text{n}}=1\mathrm{.}5{10}^{11}m.$ Calculate the mass of

the Sun $(M_{\text{s}\text{u}\text{n}})$ in the unit of kg$.$ You can use $M_{\text{s}\text{u}\text{n}}=r_{\text{s}\text{u}\text{n}}\frac{v^2}{G},$ where $v$ is the orbital speed of the

Earth around the Sun in units of $m{s}^{-1}$ and $G=6\mathrm{.}674{10}^{-11}{m}^{3}k{g}^{-1}{s}^{-2}.$