Blue Planetary

Blue Planetary The 8th-magnitude planetary nebula NGC 3918 in Centaurus. The name was given it by J. F. W.Herschel, who described it as like Uranus but larger. It is about 2600 l.y. away.

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"Blue Planetary." A Dictionary of Astronomy. 1997. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>.

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