Betelgeuse May Be Closer to the End Than We Thought

Betelgeuse is fading again. It has been since January. The light carrying that news left the star sometime in the 1470s — so whatever it is actually doing tonight, nobody will find out for another five hundred years. A full portrait of the red supergiant in Orion's shoulder: how it formed ten million years ago, why it is running from the place it was born at thirty kilometres a second, what really caused the Great Dimming of 2019, the companion star confirmed orbiting inside its atmosphere in July 2026, and what becomes of the constellation when it finally goes. It also does the arithmetic honestly — the chance of it exploding this year is about one in a hundred thousand, and at five hundred and fifty light-years it is roughly twenty times too far away to do us any harm. Two hours, told slowly and without hurry, for listening in the dark. CHAPTERS 0:00 — The Star That Is Fading Tonight 9:38 — The Body 17:10 — The One That Ran 24:25 — The Colour of a Life 32:44 — How We Learned To Look 41:53 — The Cloud It Makes 49:05 — A Spin It Should Not Have 57:38 — The Winter Everyone Noticed 1:05:15 — Where the Light Went 1:13:20 — Siwarha 1:22:24 — How Long It Has 1:31:12 — What Arrives First 1:39:43 — What Stays SOURCES • Joyce et al. (2020), ApJ — mass, radius and distance from asteroseismic modelling • Montargès et al. (2021), Nature — VLT/SPHERE imaging of the Great Dimming • Dupree et al. (2022), ApJ — the surface mass ejection and its aftermath • Levesque & Massey (2020), ApJ — photospheric temperatures during the dimming • Kervella et al. (2018), A&A — the ALMA rotation measurement • Ma, Phinney & Spruit (2024), ApJL — convection as an alternative to rotation • Howell et al. (2025), ApJL — first direct detection of the companion • Montargès, Boccaletti et al. (2026), A&A — VLT/SPHERE confirmation of Siwarha • Goldberg et al. (2026) — reflected light at the companion's bow shock • Saio et al. (2023) and Molnár et al. (2023) — the evolutionary stage dispute • Goldberg, Bauer & Howell (2020), RNAAS — predicted apparent magnitude • Gehrels et al. (2003), ApJ — supernova distance and atmospheric effects • Neuhäuser et al. (2022), MNRAS — colour change from historical records • Hamacher — variable stars in Aboriginal Australian traditions • AAVSO — the visual light curve, 1893 to the present