"Unveiling the Mysteries of an 800-Year-Old Explosion's Echo"

Scientists have discovered the remnant of a rare supernova explosion that appeared in the night sky in 1181, providing a new spectacular view of the event that was visible for 185 days. The composite image, created using data from various telescopes, shows a nearly circular nebula with a central star in the constellation Cassiopeia. X-ray observations reveal the full extent of the nebula, while studies of its composition suggest it was formed in a sub-luminous Type Iax event, a special kind of supernova resulting from the merger of two white dwarf stars. This discovery offers a unique opportunity for studying rare explosions and the formation of "zombie" stars.