Consider a bright star in our night sky. Assume its distance from Earth is 19.7 light-years (ly) and its power output is 4.00 x 1028 W, about 100 times that of the Sun. One light-year is the distance traveled by light through a vacuum in one year. (a) Find the intensity of the starlight at the Earth. W/m (b) Find the power of the starlight the Earth intercepts. (The radius of Earth is 6.38 x 106 m.) MW TA M u a