Editing Variable star (section)

====Novae====
{{Main|Nova}}
[[Nova]]e are also the result of dramatic explosions, but unlike supernovae do not result in the destruction of the progenitor star. Also unlike supernovae, novae ignite from the sudden onset of thermonuclear fusion, which under certain high pressure conditions ([[degenerate matter]]) accelerates explosively. They form in close [[binary system (astronomy)|binary system]]s, one component being a white dwarf accreting matter from the other ordinary star component, and may recur over periods of decades to centuries or millennia. Novae are categorised as ''fast'', ''slow'' or ''very slow'', depending on the behaviour of their light curve. Several [[naked eye]] novae have been recorded, [[Nova Cygni 1975]] being the brightest in the recent history, reaching 2nd magnitude.