# NASA Hubble study finds Andromeda star formation slowing over the last 40 million years

_Tuesday, July 28, 2026 at 8:00 AM EDT · Science · Latest · Tier 2 — Notable_

NASA's Hubble Space Telescope found that the Andromeda galaxy has been slowing its star formation for about 500 million years with a steeper drop in the last 40 million years, NASA announced.

By mapping two-thirds of Andromeda's disk and studying 200 million stars, scientists pieced together the cosmic slowdown. The study links a burst of star formation about two billion years ago to a probable merger with another galaxy.

Since then, star formation has quieted down, especially in a ring 32,000 light-years from the galaxy's center. Lead author Tobin Wainer of the University of Washington said it is not because the galaxy ran out of material but more like a breather after all that action.

## Sources

- [NewsBytes](https://www.newsbytesapp.com/news/science/hubble-finds-andromedas-star-formation-slowing-over-500-million-years/tldr)

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