This deep dive is a biography, but the subject is a star: Betelgeuse, a red supergiant with 10 to 20 times the mass of our sun, racing through space at 30 kilometers per second and destined to explode in a supernova that will shine like a half moon for months. We start with identity, tracing how the Arabic name meaning the hand of Orion became Betelgeuse through a 13th-century misread of a single dot, and how Aboriginal Australian oral traditions and ancient Chinese records describing a yellow star captured the star's variability and evolution long before telescopes.

From there we rewind 10 to 12 million years to its birth in the Orion OB1 association, explain how it was kicked out as a runaway star, and lay out its staggering anatomy: a radius up to 760 times the sun that would swallow Mars and reach nearly to Jupiter, with convection cell ...