Hongkongers looking at the morning sky on Thursday may have thought they were witnessing a rare pink aurora – but it was most likely to be light pollution. A large swathe of the sky above Kai Tak Stadium glowed pink in the early hours, but the Observatory said it was not linked to a geomagnetic storm recorded in recent days. “We have conducted a preliminary inspection of the photos and we do not believe this is a natural phenomenon,” the Observatory said. Instead, the forecaster said surrounding...