Astronomers say a recent challenge to one of the most important discoveries in modern cosmology has been resolved, with new research confirming that the universe is still expanding at an accelerating rate.
The debate began in late 2025 when a group of astronomers published findings suggesting that evidence for dark energy, the mysterious phenomenon thought to drive the universe's accelerating expansion, was weakening. Their analysis raised the possibility that the expansion of the universe might no longer be speeding up.
The researchers argued that the standard approach for measuring cosmic expansion using supernovae, the explosive deaths of stars, contained fundamental flaws.
However, a new investigation led by the University of Southampton has reexamined the data and reached a different conclusion. According to the team, the universe continues to behave exactly as current cosmological models predict.
The study, published in the Monthly Notices of the Royal Astronomical Society, includes Nobel Prize-winning astrophysicists Professor Adam Riess and Professor Brian Schmidt.
