What is the role of the central white dwarf in the life of a planetary nebula?
Answer
It radiates intense ultraviolet light that illuminates the discarded gas.
After a star exhausts its nuclear fuel and sheds its outer layers, the core that remains behind is a white dwarf. This dense remnant is incredibly hot and emits powerful ultraviolet radiation. This radiation is what causes the surrounding gas, which was previously part of the star, to glow. Without this constant source of illumination from the white dwarf, the nebula would not be visible.
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