![]() However, a great deal is unknown about how cataclysmic variables act between nova events, and the researchers knew that finding the modern-day trace of a past nova could help shed light on the structures' life cycle. And once a cataclysmic variable - the duo of white dwarf and companion star - goes nova, more novas can theoretically explode there in the future. Novas leave their stars intact, unlike more powerful supernovas. Much remains a mystery about the aftermath of novas. The nova occurs after a white dwarf siphons too much fuel from its companion star, which eventually leads to a nuclear detonation. ![]() The sun and most sun-like stars will one day become white dwarfs. In a classical nova, one member of the binary is a white dwarf - a superdense, Earth-size core of a dead star that is left behind after its star has exhausted all its fuel and shed its outer layers. "Roughly 75 percent of all stars are in binary star systems," Shara told. The details of the star explosion suggested it was a classical nova - a nuclear explosion that happens in binary star systems. (Image credit: by Karl Tate, Infographics artist) ![]() How is a supernova different from a hypernova? Learn about the different types of exploding stars that astronomers have identified in this infographic.
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