The origins of supernovas may be linked to the age of the star before the explosion as well as how metal-rich its galaxy may have been, according to research published in the journal Science. Scientists studied the remnants of 188 Type 1a supernovas, bringing them closer to unlocking the mysteries of exactly how and why supernovas occur. "The typical mass of a white dwarf is not large enough to trigger an explosion; it is suggested that either merging of two white dwarfs in a binary system or continuous accretion of mass from a companion by a white dwarf is required to reach that limit," said Xiaofeng Wang, who led the study.

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