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You are orbiting an invisible giant right now. You're moving at about 230 km/s around something you can’t see. Sagittarius A* is the supermassive black hole at the center of the Milky Way: about 4 million times the mass of our Sun, hidden behind dust, 26,000 light-years away. In this ~28-minute contemplative documentary, we trace the dark heart of our galaxy: • Why the Milky Way’s center was invisible in optical light, and how radio/infrared revealed it. • The patient experiment: decades of tracking star orbits near the galactic center (Keck + VLT). • S2’s 16-year orbit: how a single star’s motion proved an unseen ~4-million-solar-mass object. • The 2022 Event Horizon Telescope portrait: a bright ring of hot gas around a shadow... our first “face” of Sgr A*. • Scale: what “four million Suns” really means, and how small the horizon is compared to the solar system. But not the gravity. • The time gulf: we can’t see Sgr A* “now.” Only as it was 26,000 years ago. • The anchor: how the Milky Way’s inner heart bends to this quiet, invisible landmark. — Atta, The Quiet Observatory Correction (12:58): I misspoke in the VO. The speed of light is ~300,000 km/s, not 300 km/s. Sources and further reading below. SAGITTARIUS A* — BASICS / OVERVIEW ESO — First image of our black hole (Sgr A* image page; Credit: EHT Collaboration) https://www.eso.org/public/unitedkingdom/images/eso2208-eht-mwa/ ESO — Astronomers reveal first image of the black hole at the heart of our galaxy (press release) https://www.eso.org/public/news/eso2208-eht-mw/ EHT Collaboration (2022) — First Sagittarius A* Results I: “The Shadow of the Supermassive Black Hole in the Center of the Milky Way” (ApJ Letters; ADS) https://ui.adsabs.harvard.edu/abs/2022ApJ...930L..12E/abstract Wikipedia — Sagittarius A* (overview + references) https://en.wikipedia.org/wiki/Sagittarius_A* THE INVISIBLE CENTER — DUST / RADIO DISCOVERY / NAMING CONTEXT Goss, Brown & Lo (2003) — The Discovery of Sgr A* (history + discovery details; arXiv) https://arxiv.org/abs/astro-ph/0305074 Balick & Sanders (1974) — Radio fine structure in the Galactic Center (early radio work; PDF via ADS) https://adsabs.harvard.edu/pdf/1974ApJ...192..325B THE SEARCH — STAR ORBITS (KECK + VLT) / MASS FROM STELLAR MOTION Schödel et al. (2002) — A star in a 15.2-year orbit around the supermassive black hole at the centre of the Milky Way (Nature; ADS) https://ui.adsabs.harvard.edu/abs/2002Natur.419..694S/abstract Schödel et al. (2002) — arXiv preprint (free full text) https://arxiv.org/abs/astro-ph/0210426 Ghez et al. (2008) — Measuring Distance and Properties of the Milky Way’s Central Supermassive Black Hole with Stellar Orbits (ApJ; ADS) https://ui.adsabs.harvard.edu/abs/2008ApJ...689.1044G/abstract Gillessen et al. (2009) — Monitoring Stellar Orbits Around the Massive Black Hole in the Galactic Center (ApJ; ADS) https://ui.adsabs.harvard.edu/abs/2009ApJ...692.1075G/abstract GRAVITY Collaboration / Abuter et al. (2018) — Detection of the gravitational redshift in the orbit of S2 near Sgr A* (A&A; full text) https://www.aanda.org/articles/aa/full_html/2018/07/aa33718-18/aa33718-18.html SHORT-PERIOD STAR (SCRIPT MENTION) — S62 Peißker et al. (2020) — S62 on a 9.9-year orbit around Sgr A* (ApJ; ADS) https://ui.adsabs.harvard.edu/abs/2020ApJ...889...61P/abstract arXiv preprint (free full text) https://arxiv.org/abs/2002.02341 EHT “RECEIPTS” — M87* (2019) + Sgr A* (2022) EHT — Press release: first image of M87* (2019) https://eventhorizontelescope.org/press-release-april-10-2019-astronomers-capture-first-image-black-hole EHT Collaboration (2019) — First M87 Results I: “The Shadow of the Supermassive Black Hole” (ApJ Letters; ADS) https://ui.adsabs.harvard.edu/abs/2019ApJ...875L...1E/abstract EHT — Astronomers reveal first image of the black hole at the heart of our galaxy (Sgr A*, 2022) https://eventhorizontelescope.org/blog/astronomers-reveal-first-image-black-hole-heart-our-galaxy MILKY WAY CONTEXT (MASS BUDGET / “200 BILLION STARS” + DARK MATTER) NASA — What Does the Milky Way Weigh? Hubble and Gaia Investigate https://science.nasa.gov/missions/hubble/what-does-the-milky-way-weigh-hubble-and-gaia-investigate/ ARCHIVAL IMAGE CREDITS (USED IN THIS FILM) TON 618 “By Sloan Digital Sky Survey, Apache Point Observatory, Astrophysical Research Consortium - Aladin Lite, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=97489739” Sagittarius A* “By EHT Collaboration - https://www.eso.org/public/images/eso2208-eht-mwa/ (image link), CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=117933557” M87* “By Event Horizon Telescope, uploader cropped and converted TIF to JPG - This image has been extracted from another file, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=77925953” Music (licensed via Artlist): Kyle Preston; Fable Forte; Lars Bork Andersen