China is set to launch three astronauts to its Tiangong space station on Sunday aboard the Shenzhou-23 spacecraft, in a mission that will mark the country’s longest-ever stay in space for one crew member.

The mission aims to study the effects of long-term space habitation on the human body as part of Beijing’s preparations for a crewed mission to the Moon by 2030.

The spacecraft is scheduled to launch from the Jiuquan Satellite Launch Center in northwestern China aboard a Long March-2F rocket at 11:08 p.m. local time.

The crew includes mission commander Zhu Yangzhu, pilot Zhang Yuanzhi, and payload specialist Lai Ka-ying, who becomes the first astronaut from Hong Kong to participate in a Chinese space mission.

Both Zhu Yangzhu and Zhang Yuanzhi are members of the People’s Liberation Army astronaut corps.