A planetary nebula is a type of emission nebula that consists of expanding ions shells of gases from the stars in their late lives. Due to the planet like it has a round shape.
- The Planetary nebula represents the end life cycle of a star and has 1-8 solar mass. This nebula is identified by the round and spherical shells of gases from the Steller remains.
- They are usually short-lived and play a crucial role in the evolution of the milky way. Having very complex and extreme structures.
Hence the option A and D that is a star remnant and spherical shape is correct.
Learn more about the how can a planetary nebula be identified.
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