How does the temperature inside the umbra of a sunspot compare with the solar photosphere outside the sunspot?
A) The umbra is about 100 K hotter.
B) The umbra is about 4000 K cooler
C) The umbra is about 1500 K cooler.
D) They are about the same temperature, the umbra being an absorbing layer over the sunspot.
Correct Answer:
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