Milky Way's disk grew 'upside down,' with younger stars forming in ever-thinner layers
Astronomers have discovered that the Milky Way's disk formed in an 'upside down' manner, with younger stars settling into increasingly thinner layers over time. This finding helps clarify the structural evolution of the galaxy's thin and thick disks.
Why it matters
Understanding the formation of galactic disks provides critical insights into the history and physical evolution of the Milky Way.
edited by Swati Mestri , reviewed by Robert Egan
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