Answer: Planetary nebular is
A shell of gas ejected by and expanding away from an extremely hot dying high-mass star
An expanding atmosphere of a low-mass star as it becomes a red Giants.
Step-by-step explanation:
Planetary nebular is a form of nebula emission that comprises an expanding and glowing shell of gas that is ejected from red giant stars.
Planetary nebulae play an important role in the chemical evolution of the Milky Way by expelling elements into the interstellar medium from stars where those elements were produced.