Crab Nebula

The Crab Nebula was a nebula located within the galaxy of Mutter's Spiral. It was created circa 5300 BC when the natives of Uxarieus tested their new Doomsday Weapon by detonating a star. This supernova became visible on Earth in 1054. (DW: Colony in Space)

Another account claims that the Crab Nebula was created during the Millennium War. (PDA: The Quantum Archangel)

The planet Wengrol was located in the Crab Nebula. (DWA: The Sons of the Crab)

The first date (circa 5,300 BC) would make real-world astronomical sense, as the supernova that caused the formation occurred around that time.