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Nova
A nova is the explosion of a star. A very important nova is a supernova. At the end of its life, depending of its power, of its size, of its external and internal temperatures, the star will create a red giant star, a nova or a supernova Websites of the CNRS http://cdfinfo.in2p3.fr/Culture/Supernovae/ and of the NASA http://imagine.gsfc.nasa.gov/docs/science/know_l2/supernovae.html are very well documented in this subject. See also back hole, sun, supernova
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