You See Two Main- Sequence Stars with the Same Spectral

question 15

Multiple Choice

You see two main- sequence stars with the same spectral type. Star 1 is dimmer in apparent brightness than Star 2 by a factor of 100. What can you conclude, assuming there is no absorption of either star's light by interstellar gas or dust?

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

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