How is sunspot activity on the side of the Sun facing away from Earth monitored?
A) We must wait 1 month until that side rotates to face Earth.
B) This can be done only from a spacecraft on the far side of the Sun.
C) Sunspots on the far side of the Sun influence the reflection of sound waves toward the near side, where they can be monitored.
D) Neutrinos reflecting from the sunspots on the far side add to the number reaching Earth.
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