| Share
 

Dictionary


plan'etary neb'ula



Astron.
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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

planetaryplanetary precession
See also:

 

Related Content