If the distance between us and a star is doubled, its apparent brightness will decrease by a factor of four.

Name: If the distance between us and a star is doubled, its apparent brightness will decrease by a factor of four.
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Quizplus · Accepted Answer

This is because the apparent brightness of a star follows the inverse square law, which states that the brightness decreases with the square of the distance. So, if the distance is doubled, the brightness decreases by $2^2 = 4$.

If the Distance Between Us and a Star Is Doubled