TLDR
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Astronomers pinpointed the outer boundary of the Milky Way’s star-forming disk at 40,000 light-years from the galactic center.
Key Takeaways
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The star-forming disk terminates at a measurable edge 40,000 light-years out, giving the Milky Way a defined structural limit.
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The finding reframes the Milky Way’s disk as having a discrete boundary rather than an indefinite fade.
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Knowing where star formation stops constrains galactic models, stellar population surveys, and estimates of the galaxy’s active mass.
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