The Sun's energy output, called brightness, varies by ____ with sunspot activity.
A)less than 1 percent
B)about 2 percent
C)about 5 percent
D)about 10 percent
E)more than 15 percent

Question

Quizplus · Accepted Answer

The Sun's energy output varies by less than 1 percent with sunspot activity. Sunspots themselves are cooler, darker regions on the Sun's surface, but the overall change in the Sun's brightness due to these spots is relatively small.

The Sun's Energy Output, Called Brightness, Varies by ____ with Sunspot