Meaning Of The Word Planetary nebula

Real Dictionary

What's the definition of Planetary nebula? Find Planetary nebula meanings, definitions and more at the Real Dictionary online.

Planetary nebula Meaning

Planetary nebula Definition
Planetary nebula Definition

What's The Definition Of Planetary nebula?

planetary nebula in American English
a glowing, expanding nebula that forms around a collapsing star
noun: an expanding shell of thin ionized gas that is ejected from and surrounds a hot, dying star of about the same mass as the sun; the gas absorbs ultraviolet radiation from the central star and reemits it as visible light by the process of fluorescence

planetary nebula in British English
noun: an expanding shell of gas surrounding a dying star, formed from matter ejected from the star's outer layers; the gas is ionized by the remaining hot stellar core, emitting light in the process

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