Stars: The sun has apparent brightness B when observed from Earth, 1.5 × 10⁸ km away. What would be the apparent brightness of the sun viewed from Pluto, which is 6.0 × 10⁹ km from the sun? A) 0.50B B) 0.25B C) 0.063B D) 0.025B E) 0.00063B

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The Answer of Stars: The sun has apparent brightness B when observed from Earth, 1.5 × 10⁸ km away. What would be the apparent brightness of the sun viewed from Pluto, which is 6.0 × 10⁹ km from the sun? A) 0.50B B) 0.25B C) 0.063B D) 0.025B E) 0.00063B

Stars: the Sun Has Apparent Brightness B When Observed from Earth