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18. Two stars, lets refer to them as star A and star B, have the same luminosities. If the apparent brightness of star A is

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18. Two stars, lets refer to them as star A and star B, have the same luminosities. If the apparent brightness of star A is 3 times that of star B, then the distance A is from Earth is (a) times the distance B is from Earth. (b) times the distance B is from Earth. 3 1 (c) v3 times the distance B is from Earth. (d) times the distance B is from Earth

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