The older stars migrated out from the galactic center, leaving the younger ones inside.
How far the Milky Way's disk extends has long been difficult to define—it doesn't end sharply, but fades away gradually at ...
How far the Milky Way's disc extends has long been difficult to define — it doesn't end sharply, but fades away gradually at its outer edges. Now, for the first time, an international team of ...
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