Emission nebulae Response area light. Dark nebulae Response area visible radiation and non-visible radiation.
Emission nebulae respond to area light because they consist of ionized gas that emits light of specific wavelengths when energized by nearby stars or other sources. This light is typically in the visible range of the electromagnetic spectrum, so area light is necessary for the emission nebulae to be visible to our eyes.
On the other hand, dark nebulae respond to both visible and non-visible radiation. These nebulae appear dark because they contain dense interstellar dust and gas that blocks or absorbs light, making them appear opaque. However, they can still respond to non-visible radiation, such as infrared or radio waves, which can penetrate the dust and reveal the presence of dark nebulae even though they are not directly visible to our eyes.
In summary, emission nebulae respond to area light in the visible range, while dark nebulae respond to both visible and non-visible radiation.