How do astronomers know how strong the magnetic field of the Sun is?
A) they measure the magnetic field of the Earth, which is a direct result of the magnetic field of the Sun
B) they measure the Sun's rotation using the Doppler effect
C) they count the number of days in the year that we get an aurora in the upper atmosphere
D) the measure the Zeeman effect (the splitting of spectral lines)
E) the diameter of a star is directly related to the size of its magnetic field
Correct Answer:
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