Large-Scale Spiral Structure of the Milky Way Traced by Young Classical Cepheids1 report from 1 outlet in 1 language · first reported 2026-09-29 04:00 UTC · updated 2026-09-29 04:00 UTC · JSONScience & technologyMilky WayReportsLarge-Scale Spiral Structure of the Milky Way Traced by Young Classical CepheidsarXiv astro-ph (astrophysics) · en · 2026-09-29 04:00 UTC