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.) 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.) Without first knowing the distances to these stars, you cannot draw any conclusions about how their true luminosities compare to each other. The luminosity of Star 1 is a factor of 100 less than the luminosity of Star 2. Star 1 is 100 times more distant than Star 2. Star 1 is 100 times nearer than Star 2. Star 1 is 10 times more distant than Star 2.
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