The fourth batch selection programme of reserved astronauts has been launched recently, according to Chinese state television CCTV reported on Sunday. During the one-and-a-half-year selection programme, 12 to 14 reserved astronauts, including two payload specialists, will be selected.

CCTV added that the payload specialists would be selected in Hong Kong and Macau for the first time.

A payload specialist is not a professional astronaut but is flown aboard spacecraft for specific missions, as possessing the knowledge and experience required to operate a particular, unique payload carried.

Even though the background can vary - but most scientists and engineers - applicants for payload specialists must meet specific physical requirements and pass space physical examinations with multiple standards that depend on classification.

The SAR government said the preliminary selection exercise would start this Thursday and last for three weeks. Candidates would be selected from eleven universities or research institutes in Cyberport and Science Park, and five research & development centres set up by the government or other government organizations.

The suitable candidates would be aged between 30 to 45, with specific physical fitness requirements, a doctoral degree, and no less than three years of relevant professional experience.

After the preliminary selection, the suitable candidates would be referred to the mainland for further assessment.

Chief Executive John Lee Ka-chiu welcomed and expressed gratitude for the country's recruitment of payload specialists for the first time in Hong Kong in the recruitment of the fourth batch of astronauts.

Lee described the move as uplifting and exciting with great historical significance. He noted that the recruitment exercise in Hong Kong "demonstrates the country's confidence in Hong Kong's level in scientific research and development as well as her care for the development of Hong Kong's young people."