Skywatchers logged the supernova that became the Crab Nebula
On this day · 4 July 1054
In 1054 a new star blazed in Taurus, bright enough to read by at midday — the death of a star we now call the Crab Nebula.
On July 4, 1054, court astronomers in Song-dynasty China recorded a “guest star” that flared into the constellation Taurus, near the star we call Zeta Tauri. It was no ordinary visitor.
The newcomer outshone everything but the Moon. By the Chinese records it stayed visible in broad daylight for 23 days and lingered in the night sky for roughly 653 days before fading from view. Observers in Japan and the Arab world noted it too, and a pictograph in the American Southwest may mark the same blaze.
A star appeared where no star had been, and for three weeks it refused to yield to the Sun.
What they witnessed was a supernova — the violent collapse of a massive star some 6,500 light-years away. Centuries later, telescopes found a glowing, expanding wreck at that exact spot: the Crab Nebula, with a spinning neutron star at its heart. The 1054 sightings remain one of history’s best-documented stellar deaths.
Sources & references
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