
New analysis hints the universe isn’t accelerating after all
A reanalysis of Pantheon+ Type Ia supernovae, including a correction for the ages of progenitor stars, finds the cosmic expansion may be slowing instead of accelerating and that the apparent acceleration varies with direction. This challenges the dark energy paradigm, though other studies still support acceleration. The Rubin Observatory’s LSST is expected to provide a decisive test with a much larger supernova sample.






