Just after sunset on an October evening in 1408, six years into the reign of the Ming dynasty’s Emperor Yongle, Chinese court astronomers spotted a mysterious new star glowing high in the southern sky, near the heart of the Milky Way.
“It was about the size of a cup-shaped oil lamp, with a pure yellow colour, smooth and bright,” according to Hanlin Academy scholar Hu Guang, in a formal report to the emperor that interpreted its appearance as a heavenly endorsement.
