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By watching sunspots carefully over a long period of time, we should be able to figure out that the Sun is
A. hotter than most other stars.
B. 93 million miles from the Earth.
C. moving rapidly through space.
D. spinning on its axis.
E. growing larger.
The correct answer is D. spinning on its axis.
Explanation: Sunspots are temporary phenomena on the Sun’s surface that appear as dark spots and are associated with magnetic activity. By observing the movement of these sunspots across the Sun’s surface over time, scientists can determine that the Sun is rotating on its axis. This is evidenced by the differential rotation of the Sun, where different parts rotate at different rates.