Astronomers believe an "otherworldly'' light seen in the sky on Friday night is linked to a Chinese rocket launch hours earlier. Tūhura Otago Museum director and astronomer Ian Griffin said the striking phenomenon appeared about 30 minutes after a rocket reportedly lifted off from China. ''As I understand it, there was a launch at about half past six our time,'' Griffin said. ''Roughly half an hour later, the rocket was passing over New Zealand when there was likely a stage separation or firing of rocket jets, and it became incredibly bright in the sky.'' Griffin said the launch of a Long March-2D rocket carrying experimental satellites reportedly took place from the Xichang Satellite Launch Center earlier that afternoon Beijing time. Reports and images of a glowing cloud moving across the sky quickly surfaced on social media, with sightings spanning much of the country.…