Scientists are discovering intriguing insights about our sun’s origins thanks to the now-retired Gaia space telescope. This amazing tool, operated by the European Space Agency, provided data on millions of stars between 2014 and 2025. Specifically, researchers identified 6,594 “solar twins” — stars that share key characteristics with our sun. That’s around 30 times more than previous surveys found.
Most of these twin stars are located near the sun, suggesting a broader phenomenon. Over billions of years, many stars migrated away from the busy center of our galaxy, the Milky Way. This mass movement gives us clues about our sun’s journey from its birthplace to where it is now.
Daisuke Taniguchi, an assistant professor at Tokyo Metropolitan University, explained, “By studying these solar twins, we found evidence that many migrated together around the same time as the sun.” This new information may reshape our understanding of how the sun developed its current position.
Taniguchi co-led a recent study in the journal *Astronomy & Astrophysics*. The research suggests that the formation of the Milky Way’s central “bar” of stars and gas didn’t just foster more star creation. It also pushed many stars, including our sun, into different regions of the galaxy.
Previous studies suggested the sun must have moved thousands of light-years away from the Milky Way’s center. However, the galactic bar, acting as a barrier, complicates this picture. Researchers propose that the bar formed only after the sun and its twin stars had already migrated.
Taniguchi’s research indicates that this migration likely happened between 4 to 6 billion years ago, which aligns with the sun’s age of about 4.5 billion years. This timeline is significant because it highlights a period of change in the Milky Way, suggesting a drop in the hostile conditions found near the galactic center.
In the galaxy’s core, extreme events, such as supernovas, happen more often. These occurrences make the area less suitable for life. Taniguchi suggests that if the sun moved outward shortly after its birth, it potentially spent most of its existence in a quieter environment, more favorable for the development of life.
This finding encourages us to reconsider how life on Earth may have emerged. Rather than being a mere chance, our sun’s life-friendly setting could be linked to the formation of the galactic bar. This provides an exciting new perspective on the factors that contribute to habitable environments in our galaxy.
