New measurements suggest a more extensive galaxy
An international team of researchers has recently analyzed data from supernovae and gamma‑ray bursts to reassess the Milky Way’s dimensions. Their study indicates that both the stellar disk and the surrounding halo extend farther than earlier models predicted.
Method: Cosmic explosions as distance markers
By observing Type Ia supernovae, whose intrinsic brightness serves as a standard candle, the scientists derived accurate distances to remote star clusters. This approach was complemented by measurements of gamma‑ray bursts, which act as additional luminosity indicators.
Findings and implications
The results reveal that the outer reaches of the Milky Way could be up to 30 % larger than previously thought. This has consequences for models of dark matter distribution and the galaxy’s overall gravitational profile.
Future work
Further observations with the James Webb Space Telescope and upcoming survey missions are planned to confirm these findings and refine the Milky Way’s structural model.