Universe Expansion Still Accelerating Confirmed

A new study led by the University of Southampton, co-authored by Nobel laureates Professor Adam Riess and Professor Nathan Schmidt, has re-affirmed that the universe's expansion is still accelerating. This study directly refutes claims made in late 2025 by a team of South Korean researchers, who suggested that evidence of dark energy was weakening and the expansion was decelerating. The University of Southampton-led team found that the previous study contained a critical calibration error, specifically in how the age of Type Ia supernovae and their host galaxies were estimated, and failed to account for the mass of host galaxies. The new findings, published in Monthly Notices of the Royal Astronomical Society, confirm the robustness of the original Nobel Prize-winning discovery and allow astrophysicists to refocus on understanding the nature of dark energy.