NASA · Space

Supernova Remnant Pa 30

The Astronomy Picture of the Day features Nebula Pa 30, likely the remnant of a supernova explosion observed in 1181.

This nebula was observed using the Gemini North Telescope. Historical records from Chinese, Japanese, and Arabic astronomers describe a "guest star" visible for 185 days in 1181, believed to be this supernova.

The explosion is classified as a Type Iax supernova, possibly caused by the merger of two white dwarfs. The exact mechanisms of this unusual explosion remain unknown.

A hot central star within the remnant generates a strong wind, potentially forming radial filaments. These filaments contain pearl-like knots, each approximately 4 light-days in diameter.

Understanding the formation of this nebula continues an 845-year-old mystery.

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