What is the definition of Planetary nebula? | Dictionary.net

PLANETARY NEBULA

\plˈanɪtəɹi nˈɛbjʊlə], \plˈanɪtəɹi nˈɛbjʊlə], \p_l_ˈa_n_ɪ_t_ə_ɹ_i n_ˈɛ_b_j_ʊ_l_ə]\

Definitions of PLANETARY NEBULA

2006 - WordNet 3.0
2011 - English Dictionary Database

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a nebula that was once thought to be a star with its planets but is now thought to be a very hot star surrounded by an expanding envelope of ionized gases that emit a fluorescent glow because of intense radiation from the star

2006 - WordNet 3.0
By Princeton University

a nebula that was once thought to be a star with its planets but is now thought to be a very hot star surrounded by an expanding envelope of ionized gases that emit a fluorescent glow because of intense radiation from the star

2011 - English Dictionary Database
By DataStellar Co., Ltd

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