7 answers
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The two correct answers are:
- Spherical shape
- Diffuse edges
- Spherical shape
- Diffuse edges
1. Spherical Shape: Planetary nebulas generally have a round or spherical shape. This is due to the material from the dying star being ejected in a symmetric manner, creating a shell-like structure.
2. Diffuse Edges: The outer edges of a planetary nebula should appear blurred or hazy. This is because the gas and dust expelled by the dying star create a glowing, cloud-like structure that is not sharply defined.
Therefore, the two correct answers are:
1. Spherical shape
2. Diffuse edges