"The relationship between a star' $ luminosity and brightness is described by the inverse square law:
Luminosity B & Or, in words: Brightness C d2 (distance) ? Let's use this expression to solve a problem. Star X and Star Y are identical stars. If Star X is located 10 light-years from Earth and Star Y is located 30 light-years B Star X from Earth, what is the ratio of their brightnesses, 2 Show your work B Star Y below."