Zombie Star Lurks at the Center of a Supernova

Some 7,500 light-years away, the wreckage of a star that blew up in 1181 hangs in long, straight threads, and nearly every thread is a string of beads. The star is still there at the center, apparently unmoved.

Astronomers in Japan, China and the Arab world recorded the blast at the time. Its remains, a nebula now called Pa 30, went unidentified until a citizen science effort spotted them in archival infrared images in 2013.

No other known supernova remnant resembles it. The survivor at its heart burns near 200,000 C (360,000 F) and sheds a wind of roughly 16,000 kilometers (10,000 miles) per second. The leading suspect is a feeble thermonuclear explosion, possibly triggered when two white dwarfs merged.

Deep imaging with Gemini North found about 10 times as many filaments as earlier studies. Up close, they are lumpy. Most are chains of clumps roughly 100 billion kilometers (62 billion miles) wide, spaced with a regularity that holds across filament after filament.

Why is unclear. One proposal, the star's wind sculpting the threads, sits badly with such even spacing. Two others can produce knots only on a tight schedule or with help from rapid cooling, and whether cooling makes a tidy row or a mess is an open question.

The team also located the nebula's geometric center. It sits on the star. Simulations allow survivors a shove of up to 600 kilometers (373 miles) per second; this one got under about 100 kilometers (62 miles) per second, if anything at all.

The star blew up without leaving the room. Its debris strung itself into beaded rows that every leading model struggles to account for.

Read the full story at The Astrophysical Journal, October 6, 2026

Hot Take: Astronomers call debris that queues neatly after a catastrophe unexplained. Any British bus stop would call it Tuesday.