If the Sun's distance were three times its current distance, the "surface brightness" (apparent brightness per unit angular area) would be equal to its current surface brightness. 1/3 its current surface brightness. 1/9 its current surface brightness. 9 times its current surface brightness. 3 times its current surface brightness.
If the Sun's distance were three times its current distance, the "surface brightness" (apparent brightness per unit angular area) would be equal to its current surface brightness. 1/3 its current surface brightness. 1/9 its current surface brightness. 9 times its current surface brightness. 3 times its current surface brightness.
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Transcribed Image Text:If the Sun's distance were three times its current distance, the "surface brightness" (apparent
brightness per unit angular area) would be
equal to its current surface brightness.
1/3 its current surface brightness.
1/9 its current surface brightness.
9 times its current surface brightness.
3 times its current surface brightness.
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