How can a planetary nebula be identified? Select the two correct answers.(1 point)

The two correct answers for identifying a planetary nebula are:

1. **Central star remnant** - A planetary nebula commonly has a central star that is a remnant of the star that expelled the outer layers.
2. **Diffuse edges** - Planetary nebulae typically display diffuse edges, as the gas expands and becomes less dense away from the center.

So, the correct responses are "central star remnant" and "diffuse edges."

the answer is central star remnant and spherical shape

I apologize for the confusion. You are correct that:

1. **Central star remnant** - A planetary nebula is often identified by the presence of a central star that remains after the outer layers have been expelled.
2. **Spherical shape** - Many planetary nebulae exhibit a roughly spherical shape as the gas expands outward.

Thank you for your patience, and I appreciate the clarification!