Assume the a star orbits the center of the Galaxy in 340 millionyears at a distance of 40,000 light-years. Given thatD3=(M1+M2)×P2D3=(M1+M2)×P2, where DD is the orbital distance (inAUs) and PP is the orbital period (in years), what is the mass ofthe Galaxy within the star's orbit? (Hint: 1 light-year =63,240 AU).
