Summary:

- In 1181 CE, a supernova was observed in the sky, and it has now been observed that this supernova is still releasing glowing filaments of material.
- Astronomers have been studying the remnants of this supernova, known as G130.7+3.1, and have found that it is continuing to expand and release material over 800 years after the initial explosion.
- The study of this long-lasting supernova remnant provides valuable insights into the physics of these powerful stellar explosions and the evolution of the material they eject into the surrounding interstellar medium.