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Loading contentThe flattened, rotating layer that holds most of the Milky Way's stars, gas, and dust, and where stars are still being born today. Only a few hundred parsecs thick but tens of thousands across, it contains the spiral arms and the young, metal-rich stars of the Galactic disc — the Sun among them.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.