EMISSION NEBULA

Domain	Definition
Astronomy	A type of nebula that shines by emitting light when electrons recombine with protons to form hydrogen atoms. The electron frequently approaches the proton in steps emitting energy as light as it gets pulled in. In one of the most common "steps," the recombining electron emits a photon of red light. Since many atoms in the nebula do this all at once, the nebula appears red in color. This type of nebula is created when energetic ultraviolet light from a hot star shines on a cloud of hydrogen gas, stripping away electrons from the atoms (ionization). The free electrons can then begin the process of recombination. Plural of nebula: nebulae. (references)
Source: compiled by the editor from various references; see credits.

Frequency of Internet Keywords: EMISSION NEBULA

The following statistics estimate the number of searches per day across the major English-language search engines as identified by various trade publications. Hyperlinks lead to commercial use of the expression at Amazon.com.

Anagrams: EMISSION NEBULA

Scrabble® Enable2K-Verified Anagrams
	Words within the letters "a-b-e-e-i-i-l-m-n-n-o-s-s-u"
	-4 letters: insensible, lesbianism, limousines, moniliases, mousseline, nimbleness.
	-5 letters: albinisms, albumoses, alienisms, alienness, alimonies, aloneness, balminess, baselines, biennales, biennials, bienniums, binomials, bluenoses, bonemeals, emulsions, insomnias, limonenes, limousine, mainlines, manliness, messaline, minibuses, misunions, mobilises, nebulises, nobeliums, nobleness, olibanums, omissible, omnibuses, seleniums, semolinas, solanines, unionises, unionisms.
Source: compiled by the editor from various references; see credits. SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro.