How many times brighter does the Sun appear from Earth than it does from Neptune, which has an orbital radius of approximately 30 au? A) 30 B) 30 × 2.512 = 75.4 C) (30)² = 900 D) 4 $\pi$ (30)² = 1130

Question

Quizplus · Accepted Answer

The brightness of the Sun from a planet decreases with the square of the distance from the Sun. Since Neptune is about 30 times farther from the Sun than Earth, the Sun appears (30)^2 = 900 times brighter from Earth than from Neptune.

How Many Times Brighter Does the Sun Appear from Earth π\piπ

How Many Times Brighter Does the Sun Appear from Earth $\pi$