1181 Supernova's Remnant Reveals 'Cosmic Pearls' in New Image

Astronomers have produced the sharpest image yet of Pa 30, the remnant of a supernova that sky-watchers in China and Japan recorded in 1181, according to Wired. The new picture, taken with the Gemini North telescope in Hawaii, shows roughly 10 times more structure than any prior image of the remnant, Wired reported.

What makes this new image different?

Earlier photos of Pa 30 showed a sphere of thin, filament-like strands radiating outward, resembling fireworks or a dandelion. The higher-resolution Gemini North data show those filaments are not continuous. They are made of distinct, bead-like knots of gas strung along each strand, Wired reported, citing the study.

What are the 'cosmic pearls' astronomers found?

The knots, nicknamed "cosmic pearls," are each about four light-days across, according to the study published in The Astrophysical Journal and cited by Wired. Study coauthor Ilaria Caiazzo said in a press release quoted by Wired that "the planetary region of our solar system could fit in each knot about 10 times with room to spare." Caiazzo added: "The knots are quite strikingly uniform. We are excited to try to model them."

Researchers expected post-explosion debris to be irregular. Instead, the knots are similar in size and line up along the filaments, a pattern that has not been explained, Wired reported.

By the numbers

• 1181: the year Chinese and Japanese astronomers recorded a new, temporary star in the sky, later linked to Pa 30.
• 10x: how much more structural detail the new Gemini North image reveals compared with earlier observations.
• ~4 light-days: the diameter of each individual "pearl" knot in the remnant.
• ~10x: how many times the solar system's planetary region could fit inside a single knot, per Caiazzo.

Why does this star's survival matter?

Pa 30 is unusual because its central star did not fully die. Most thermonuclear supernovas destroy the star completely. In rare cases, part of the star survives, producing what scientists call a "zombie star," Wired reported. Researchers do not yet know how or why a star can survive its own explosion, and the newly resolved knot structure could help them work backward to the physics of the detonation.

How does this connect to a historical sighting?

The remnant is tied to medieval astronomical records describing a new star that stayed visible for months in 1181. Centuries later, scientists connected those written accounts to the physical remnant now cataloged as Pa 30, giving researchers a rare case where a stellar explosion has both a precise historical timestamp and modern high-resolution imaging, according to Wired.

What to watch next

• Whether modeling of the uniform knots explains how they formed during or after the explosion.
• Further study of the surviving central star to clarify how some stars partially survive supernovas.
• Follow-up observations testing whether other remnants show similar bead-like filament structure once imaged at comparable resolution.

The full findings appear in The Astrophysical Journal, as reported by Wired.

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