Question

question 2
a planetary nebula is
the glowing cloud of gas ejected from a low - mass star at the end of its life
another name for a helium flash which causes the formation of planete
another name for a brown dwarf at the end of its life
the result of an exploding planet

Explanation:

A planetary nebula is formed when a low - mass star ejects its outer layers of gas at the end of its life, creating a glowing cloud. A helium flash is related to the ignition of helium in a star's core and not the same as a planetary nebula. Brown dwarfs are sub - stellar objects and not related to planetary nebulae. Planets do not explode to form planetary nebulae.

Answer:

the glowing cloud of gas ejected from a low - mass star at the end of its life