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Cometary Nucleus

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Nucleus, Cometary 

the central part of a comet, which, according to current concepts, consists of water vapor with traces of “ices” of other gases, as well as rocky substances. Together with the nebulous envelope, or coma, the nucleus forms the head of the comet. (See.)
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Stardust Flight and Recovery Team of NASA Jet Propulsion Laboratory -- Exceptional achievement during its historic seven-year planetary space flight to bring to Earth samples of primordial material from a cometary nucleus, unchanged since the birth of our solar system 4.
Rotary National Award for Space Achievement Recognizes Winners by PR Newswire
It is also contributing to a study of the physical properties of the cometary nucleus and surface, inner structure, and tail.
European plan to land space craft on comet by Coventry Evening Telegraph (England)
But occasionally a cometary nucleus leaves its fellows and plummets into the inner solar system, where it may come close enough to the Sun for us to designate it as a long-period comet; or else it might make a close pass by one or more of the major planets, and have its orbit progressively altered, so that eventually we describe it as a short-period comet.
At the heart of a trillion worlds by Sagan, Carl; Druyan, Ann / Saturday Evening Post
 
 
 
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