One method that has been used successfully in recent times to investigate the deep interior of the Sun has been to observe
A) regular 5-minute oscillations and fluctuations of the surface.
B) the spectrum and behavior of a sunspot, whose roots are deep inside the Sun.
C) the progress of a solar-impacting comet.
D) physical conditions in the deep interior, using a spacecraft that penetrated into the Sun.
Correct Answer:
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