Shenzhou-14 crew member Chen Dong opens the door of the Wentian laboratory cabin module around 10 a.m. Monday. The 23-ton Wentian module is the second module of China’s Tiangong space station. Photo: Guo Zhongzheng/Xinhua

Chen enters the Wentian laboratory cabin. Photo: Guo Zhongzheng/Xinhua

Shenzhou-14 crew members Cai Xuzhe (left), Chen Dong (center) and Liu Yang (right) greet the public inside the Wentian laboratory cabin. Photo: Courtesy of China Manned Space Program

The Wentian module docks with the front port of the Tianhe core module combination, as seen in a simulated image from the Beijing Aerospace Control Center. The process lasted about 13 hours and was completed at 3:13 a.m. Monday. Photo: Xinhua

A Long March-5B carrier carrying the Wentian module blasts off at 2:22 p.m. Sunday from the Wenchang Spacecraft Launch Site in South China’s Hainan province. Photo: Hou Yu/China News Service, VCG

A crowd witnesses the launch event near the Wenchang Spacecraft Launch Site in Wenchang, Hainan on Sunday. Photo: Luo Yunfei/China News Service, VCG

The Wentian module separated from the Long March-5B rocket 495 seconds after the launch. Photo: VCG