What is another word for diffuse nebula?
Pronunciation: [dɪfjˈuːz nˈɛbjʊlə] (IPA) 
A diffuse nebula is a type of interstellar cloud that appears as a hazy patch of light in the sky. It is composed of gas and dust particles that scatter and absorb light. These nebulae are often found in regions of space where there has been recent star formation. Some synonyms for diffuse nebula include emission nebula, HII region, and planetary nebula. An emission nebula is a type of diffuse nebula that emits light due to the ionization of gases by high-energy radiation from young, hot stars. HII regions are also emission nebulae that contain ionized hydrogen, while planetary nebulae are nebulae created when a star like our Sun runs out of fuel and sheds its outer layers.
