Suppose two stars are identical except that one is twice as far away from us as the other. Which statement is true?
A) Both stars have the same apparent brightness, but the luminosity of the closer star is four times as great as that of the more distant star.
B) Both stars have the same luminosity, but the apparent brightness of the closer star is twice as great as that of the more distant star.
C) Both stars have the same luminosity, but the apparent brightness of the more distant star is four times as great as that of the closer star.
D) Both stars have the same luminosity, but the apparent brightness of the closer star is four times as great as that of the more distant star.
Ans: D) Both stars have the same luminosity, but the apparent brightness of the closer star is four times as great as that of the more distant star.
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