
Topic
Free account · your comment posts right after signup
Not who you're looking for? Others named nova: village in Zala county, Hungary · single by Swedish duo The Sound of Arrows · StarCraft character · late-evening current affairs programme in the Netherlands
A nova is a transient astronomical event that causes the sudden appearance of a bright, apparently "new" star that slowly fades over weeks or months. All observed novae involve white dwarfs in close binary systems, but causes of the dramatic appearance of a nova vary, depending on the circumstances of the two progenitor stars. The main sub-classes of novae are classical novae, recurrent novae (RNe), and dwarf novae. They are all considered to be cataclysmic variable stars.