8. Imagine two stars that are both the same temperature and therefore the same luminosity. Star A is three times as far from Earth as Star B, and therefore Star B looks brighter. a. How much brighter does Star B look than Star A? Show your work. Hint: Find F B / F A . b. Now image that Star A's luminosity is twice as great as Star B's luminosity. Which star appears brighter? Show your work..