Chinese scientists have retrieved equipment and samples used in experiments aboard the country's first space station. A hatch-opening ceremony of the return module of the Shenzhou-13 spacecraft was held in Beijing on Tuesday. The items retrieved from the space station, Tiangong, weighed around 73 kilograms. It also included an ultra-high-definition photographic device from the China Media Group that the three Chinese astronauts used to film their record-breaking 183 days in space.