Time & motion: press play — what moves depends on your zoom: planets orbit the Sun (years), nearby stars drift on real velocities (millennia), the Milky-Way disk rotates & winds (mega-years), and out past it the universe expands toward the Big Bang / deep future. Sandbox: drop a black hole / resize the Sun and watch real gravity reshape the orbits.

Every object is a real record — nothing is procedurally generated; the spiral-arm diagram is a labeled model. ~55,000 objects from Wikidata · OpenNGC · AT-HYG · NASA Exoplanet Archive · Fermi · LVDB; each links to authoritative sources (SIMBAD / NED / NASA / ATNF / Wikipedia). Planets: NASA fact sheets.