emission nebula

noun

, Astronomy.

1. a bright diffuse nebula that emits light as a result of ionization of its gas atoms by ultraviolet radiation, as the Orion Nebula, planetary nebulae, and supernova remnants, as the Crab Nebula.

emission nebula

noun

1. a type of nebula that emits visible radiation See nebula

emission nebula

/ ĭ-mĭsh′ən /

1. A nebula that absorbs ionizing ultraviolet radiation from nearby hot stars or star remnants and reemits it as visible light. HII regions , planetary nebulae , and nebulae created by the explosion of supernovae are different kinds of emission nebulae.
2. See more at nebula

Example Sentences

This image features the California Nebula - also known as NGC 1499 - an emission nebula in the constellation of Perseus.

From BBC

Known as the Bubble Nebula, or NGC 7635, it is an emission nebula located 8 000 light-years away; emission nebulas are interstellar clouds which are comprised of ionized gases.

From Salon

The Bubble Nebula, also known as NGC 7635, is an emission nebula located 8 000 light-years away.

From Salon

The Flame Nebula, designated as NGC 2024 and Sh2-277, is an emission nebula in the constellation Orion, lying some 900 to 1,500 light years away from Earth.

From BBC