In a planetary nebula, the shell of expelled material is glowing intensely. What is the main source of energy for this glow?
A) friction, as the atoms of the expelled shell rub against each other
B) the explosion of the dying star
C) ultraviolet radiation from the collapsing hot star at the center
D) the fusion of hydrogen into helium in the nebula
E) the change of electrons and protons into neutrons
Correct Answer:
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