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variable nebula

   Also found in: Wikipedia 0.01 sec.
variable nebula [′ver·ē·ə·bəl ′neb·yə·lə]
(astronomy)
A nebula whose shape and brightness vary; an example is in the constellation Monoceros.


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Variable stars are not uncommon but here we have one, accompanied by a very special object: NGC 1554/55 possesses a variable nebula that makes the combination outstanding.
 
 
 
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