A white dwarf survived its own supernova explosion

A white dwarf survived its own supernova explosion

Astronomers have spotted a white dwarf that miraculously survived its own thermonuclear detonation, raising questions about how and why these stars create supernovae.

A white dwarf is the evolutionary endpoint of a Sun-like a star. After such a star swells to become a red giantthen runs out of fuel necessary for nuclear fusion reactions, the star ejects its outer layers to form a planetary nebula, or a shell of diffuse gas. As the nebula expands and dissipates, it leaves behind the inert core of the star, which we call a white dwarf.

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