My trivia and facts on the Universe. Asteroids, black holes, distances, galaxies, light, Mars rovers, Moon landings, stars, Titan, Voyager program, and other Universe trivia and facts.
Thursday, May 6, 2010
Planetary nebula
Planetary nebula are the gaseous outer layers of a star that have been ejected into space from a star later in its life. This happens as a star forms into a white dwarf.
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