Suppose you see two main-sequence stars of the same spectral type. Star 1 is dimmer in apparent brightness than Star 2 by a factor of 100. What can you conclude? (Neglect any effects that might be caused by interstellar dust and gas.)
o Star 1 is 10 times more distant than Star 2.
o Star 1 is 100 times more distant than Star 2.
o The luminosity of Star 1 is a factor of 100 less than the luminosity of Star 2.