What process results in the formation of a planetary nebula?

Answer

Ejection of gas and plasma by a dying low- or intermediate-mass star transitioning to a white dwarf.

A planetary nebula is created when a low- or intermediate-mass star, up to about eight times the Sun's mass, sheds its outer layers as it evolves into a white dwarf.

What process results in the formation of a planetary nebula?
astronomynebulastar formationmass