What is the ultimate fate of the gas shells defining the Cat's Eye Nebula after thousands of years?
Answer
They will expand and disperse into the interstellar medium
The gas shells are destined to expand outward indefinitely. Over several thousand years, they will move further from the central white dwarf, resulting in decreased density and weaker ionization. Eventually, the gas will become too thin and distant to be visible. This material, rich in elements like carbon, nitrogen, and oxygen, will mix with local gas clouds, serving as raw material for the creation of future stars and planetary systems.
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