NASA Hubble finds star formation in Andromeda galaxy declining

NASA’s Hubble Space Telescope has detected a prolonged slowdown in the rate of new star formation within the Andromeda galaxy, marking a decline that has persisted for roughly 500 million years. The finding, released by the agency’s astrophysics division, comes from a comprehensive analysis of ultraviolet and infrared data collected over several observation cycles, which together trace the birth of young, massive stars across Andromeda’s spiral arms.

The study indicates that the galaxy’s star‑forming regions have produced fewer stellar nurseries than in previous epochs, suggesting a gradual depletion of the cold gas reservoirs that fuel stellar birth. Researchers note that Andromeda’s current star‑formation rate is now comparable to that of the Milky Way, a shift that may influence predictions of the two galaxies’ future interaction. Ongoing monitoring with Hubble and upcoming observations from the James Webb Space Telescope are expected to refine the timeline and explore the mechanisms behind the decline.