How can a planetary nebula be identified? Select the two correct answers.(1 point)
Responses
spherical shape
spherical shape
dark area
dark area
diffuse edges
diffuse edges
central star remnant
1 year ago
1 year ago
The correct answers are:
1. Spherical shape: Planetary nebulae often have a round or spherical shape. This is due to the expanding shell of gas and dust that is ejected from the central star.
2. Diffuse edges: Planetary nebulae have faint and diffuse edges, which make them appear soft around the edges. This is a distinguishing feature of these types of nebulae.
Dark area and central star remnant are not characteristics used to identify a planetary nebula. Dark areas can be seen in other types of nebulae, and the central star remnant can only be observed once the outer layers of the nebula have dissipated.
1 year ago
To identify a planetary nebula, you can look for the following characteristics:
1. Spherical shape: Planetary nebulae are typically round or spherical in shape. This is because they are formed by the outer layers of a dying star being expelled into space in a spherical shell.
2. Diffuse edges: Planetary nebulae have fuzzy or diffuse edges. This is because the expanding shell of gas emitted by the dying star disperses over time, creating a less defined boundary.
Therefore, the correct answers are:
- Spherical shape
- Diffuse edges