What physical process primarily causes the gas within the Cat's Eye Nebula to glow?
Answer
Ionization by ultraviolet radiation
The glowing appearance of the nebula is a direct result of ionization. As the central star transitions toward the final white dwarf stage, it becomes extremely hot and emits intense ultraviolet radiation. This high-energy radiation strikes the gas that the star has previously expelled, ionizing the atoms and causing them to emit light that is visible across vast interstellar distances.
Related Questions
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