Question

how can a planetary nebula be identified? select the two correct answers. (1 point)
diffuse edges
dark area
spherical shape
central star remnant

Explanation:

Planetary nebulae are characterized by their spherical shape (formed as gas expands symmetrically from a dying star) and the presence of a central star remnant (the core of the original star that ejected the nebula). Diffuse edges are more typical of other types of nebulae like reflection or emission nebulae, and a dark area is not a defining feature of planetary nebulae.

Answer:

spherical shape, central star remnant