Why does the number of sunspots change over time?
A) The temperature of the Sun increases and decreases over time.
B) The brightness of the Sun increases and decreases with time.
C) The Sun's magnetic field changes in strength and shape with time.
D) The solar wind changes speed with time, obscuring them.
E) The number of sunspots does not change-the spots are simply on the other side.
Correct Answer:
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