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Chandra X-ray Observatory image of the supernova remnant Cassiopeia A. The red, green, and blue regions in this X-ray image of Cas A show where the intensity of low, medium, and high-energy X-rays, respectively, is greatest. While this photo shows the remains of the exploded star, light echoes show us reflected light from the explosion itself.
The royal wedding in England this month is sure to be packed full of pomp, but a 17th century king of Great Britain might have the event trumped with a supernova that announced his birth, researchers say. The theory places the star explosion's discovery 50 years earlier than previously thought.
The glowing hot cloud known as Cassiopeia A is the remnant of a massive star explosion — a supernova — that occurred about 11,000 light-years away from Earth. The light from that cosmic detonation was first visible on Earth when it arrived sometime in the 17th century.
But the exact date of when Cas A's explosion could have been seen from Earth has been a longstanding mystery in astronomy. Records suggest the first "astronomer royal" of England, John Flamsteed, may have recorded the supernova in 1680.
Still, the light from the supernova should have been easily visible to everyone in the sky.
Now researchers argue that it was widely seen — as a "new" star that may have marked the birth of the future King Charles II of Great Britain on May 29, 1630.
Merry monarch is born
Charles II, often known as the "Merry Monarch" for his lively, hedonistic court, allegedly had a "noon-day star" appear at his birth. This became a key (and perhaps dubious) feature in later propaganda of the restoration of the monarchy that brought him into power — his father, Charles I, was executed in 1649 at the climax of the English Civil War.
"I saw a reproduced image of Charles II's 'noon-day star' in a book and had a eureka moment," said researcher Martin Lunn, former curator of astronomy at the Yorkshire Museum in England. "It fit the classic description of a supernova, and I wondered if it might be an observation of Cas A."
Lunn then sought to see how airtight the case was for dating Cas A to the latter half of the 17th century.
"The evidence for the light arriving sometime in the latter half of the 17th century is based on assumed distances to Cassiopeia A, as well as an assumed constant rate of speed for the knots of ejected gas — both of these assumptions, however, are problematic," Lunn told SPACE.com. "We can't be certain of the exact distance of Cas A, and the speed of the knots of gas could have varied due to interstellar material. These variables mean at best we've only been able to come up with an average range of dates. Considering this ambiguity, a 1630 date for Cas A isn't beyond the realm of possibility."
The trail continues
At the same time, historian Lila Rakoczy investigated what historical evidence there might have been for this noon-day star. There are many sources from the early 1660s cite this light in the sky over Charles II's birth, including the poet John Dryden.
"Going back a little further, William Lilly, the famous Parliamentarian astrologer, refers to the star, but dismisses it as Venus, in his 1651 book, 'Monarchy or No Monarchy,'" Rakoczy said. "I know of no references to the star in the 1640s, but this is not surprising considering the country was preoccupied with the English Civil War."
"Although plentiful, all of these sources are problematic because they appear 20 to 30 years after the alleged event, and the star event was used in the 1660s as a major tool of Restoration propaganda, which makes it harder to trust the accuracy of the event," Rakoczy explained.
"The strength of our case is that we have found a book, 'Britanniae Natalis,' from 1630, the year of Charles II.
