A large metallic ball fell out of the sky on a remote grassland in Namibia, prompting baffled authorities to contact NASA and the European space agency. The hollow ball with a circumference of 1.1 metres (43 inches) was found near a village in the north of the country some 750 kilometres (480 miles) from the capital Windhoek, according to police forensics director Paul Ludik. Locals had heard several small explosions a few days beforehand, he said. With a diameter of 35 centimetres (14 inches), the ball has a rough surface and appears to consist of "two halves welded together". It...