Emission nebula
Nebula formed of ionized gases that emit light of various wavelengths
Emission nebula
An emission nebula is a nebula formed of ionized gases that emit light of various wavelengths. The most common source of ionization is high-energy ultraviolet photons emitted from a nearby hot star. Among the several different types of emission nebulae are H II regions, in which star formation is taking place and young, massive stars are the source of the ionizing photons; and planetary nebulae, in which a dying star has thrown off its outer layers, with the exposed hot core then ionizing them.
Read on Wikipedia · Image The Hubble Heritage Team (AURA/STScI/NASA), Public domain
Open boosters, collect cards and trade them. Free to play.
Play for free