The Mayall 4-meter Telescope at the Kitt Peak National Observatory houses the DESI instrument. KPNO/NOIRLab/NSF/AURA/P. Marenfeld

Dark energy may have once been ‘springier’ than it is today − DESI cosmologists explain what their collaboration’s new measurement says about the universe’s history

Scientists have conflicting theories on why the universe is expanding at an accelerating rate. New measurements from a massive collaboration complicate these ideas.

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