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Substance razletaetsya planetary nebula from the central star at speeds of several tens of kilometers per second. At the same time, as the end of the central star cools down substances, radiation balances energy thermonuclear reactions are terminated, as well as star now has sufficient mass to maintain the temperature required for the synthesis of carbon and oxygen. Eventually, the star is so cool, that will cease to emit enough ultraviolet radiation to the ionization of the gas shell away. The star becomes a white dwarf, a cloud of gas rekombiniruet, becoming invisible. For a typical planetary nebula time from education to the recombination of 10 000 years.