On Thursday, a team of researchers from Hungary's Eötvös Loránd University published research in which they claim that dark energy—the elusive substance thought to make up about two-thirds of the universe—may not exist at all. In 1925, the astronomer Edwin Hubble fundamentally changed our understanding of the cosmos when he proved that the universe is expanding. By the 1990s, astrophysicists were "fairly certain" that the expansion of the universe would have to slow as time went on and gravity worked its magic on matter. But then in 1998,observations of ten supernovae provided strong evidence that the universe was not only expanding, but it was accelerating.

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