Gaia Data Reveals Milky Way’s Upside-Down Growth — SkimNews
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- Milky Way’s disk grew “upside down” in the study, with younger stars forming in ever-thinner layers.
- Gaia Space Observatory data underpinned the study’s account of the Milky Way’s change from a turbulent disk to a thin spiral galaxy.
Why it matters: For astronomers, the Gaia-based result gives the Milky Way’s formation history a concrete chronology: the disk changes from turbulent to thin-spiral, while progressively younger stars occupy ever-thinner layers. That makes the timing of the galaxy’s structural transition central to interpreting its present architecture.
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