We all know about the Royal family. We know most things about them and we also know that they also use toilet paper. We also know of the legend that a noon day star appeared on the day King Charlles II was born. Edward Matthew described it as “The Most Glorious Star… shining most brightly in a Miraculous manner in the Face of the Sun,” in 1661.
Over the many years the “royal Star” had been written off by historians claiming it was merely propaganda. Martin Lunn, the former curator of astronomy at the Yorkshire Museum in northern England said it could have been the supernova called Cassiopeia A.
Cassiopeia was a star that eventually collapsed and blew apart. Its dramatic flare of light took 11 000 years to cross the cosmos, finally reaching Earth in the 17th century. Cassiopeia A is a supernova remnant in the constellation Cassiopeia and the brightest astronomical radio source in the sky, with a flux density of 2720 Jy at 1 GHz.
The supernova occurred approximately 11,000 light-years away in the Milky Way. The expanding cloud of material left over from the supernova is now approximately 10 light-years across. Despite its radio brilliance, however, it is extremely faint optically, and is only visible on long-exposure photographs.
A supernova is a stellar explosion that is more energetic than a nova. Supernovae are extremely luminous and cause a burst of radiation that often briefly outshines an entire galaxy, before fading from view over several weeks or months.
Lunn took a new look at the evidence and says that this star could perhaps have appeared in the skies on May 29 1630, the same day King Charles II was born.

Cassiopeia A
Lunn’s work questions the current method for dating supernovae, but leads to the exciting possibility of solving a decades-old astronomical puzzle.
A supernova spotted in 1572 by the Danish astronomer Tycho Brahe lingered for 18 months. Its appearance destroyed the notion, set in stone by Aristotle, that the Universe was fixed and unchanged. It reputedly was the inspiration for the terrifying celestial portent in Shakespeare’s Hamlet.