How long does the planetary nebula phase typically last in the lifespan of a star?
Answer
Approximately 10,000 to 20,000 years
The planetary nebula phase is an exceptionally brief interlude in the life of a star. In the context of a total lifespan that spans billions of years, the duration of the nebula is fleeting, lasting only about 10,000 to 20,000 years. During this time, the ejected gas shell expands outward at high speeds into the interstellar medium. Eventually, the gas disperses and becomes too thin to be visible, leaving behind only the cooling white dwarf.
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