How can something be both an absorption nebula and an emission? Please explain and give an example.?

Answer 1

These galactic clouds only glow if there are hot stars to stimulate them. The gas in the cloud glows in a way similar to the gas inside a fluorescent lamp, but it's ultraviolet light, not an electric current, providing the stimulation. Typically, it is very hot O and B stars formed within the cloud that provide the stimulation.

Portions of the gas cloud away from these bright stars are dark. You can see this in M42, the great Orion nebula. The dark areas in that nebula are actually parts of the cloud obscuring brighter parts of the same cloud behind them.

Answer 2

Absorption Nebula

Answer 3

For your requested example, that's the Orion Nebula.

How some nebulae can be both emission and absorption nebulae comes from the relative abundance of interior elements. For instance, Orion has an abundance of hydrogen which glows brightly at particular wavelengths when energized by its young 'O' and 'B' stars. At the same time, Orion contains some formaldehyde which is a better absorption than emission element.

Answer 4

i dont know how, but a plasma star maybe an example.