For nearly a century, astronomers have known that the universe is expanding. In the late 1990s, two independent teams, the Supernova Cosmology Project, led by Saul Perlmutter, and the High-Z Supernova Search Team, led by Brian Schmidt and Adam Riess, discovered something strange: The expansion i...

Source: [Phys.org](https://phys.org/news/2026-07-dark-energy-flips-hubble-tension.html)

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