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Largest supernova dataset hints dark energy may be changing over time

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It took about 50 exploding stars to upend cosmology. Researchers mapped and measured light from Type Ia supernovae, the dramatic explosion of a particular kind of white dwarf. In 1998, they announced their surprising results: Instead of slowing down or staying constant, our universe was expanding faster and faster. The discovery of "dark energy," the unknown ingredient driving the accelerated expansion, was awarded a Nobel Prize.