The researchers said on Wednesday a micronova is by far the least powerful type of star explosions now known—less energetic than a blast called a nova in which a white dwarf's entire surface blows up and tiny compared to a supernova that occurs during the death throes of some giant stars.
White dwarfs, among the densest objects in the universe, result from the collapse of a dying star's core. They have the mass of our sun but are about the size of Earth in diameter. Most stars, including the sun, are destined to end their existence in this form.Micronovae happen in very specific binary systems—with a white dwarf star possessing a strong magnetic field and a low-mass normal star.
The explosion is localized and does not destroy the white dwarf. In fact, the micronova cycle can repeat itself.
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