A staff member stands in front of the launch pad at Jiuquan Satellite Launch Center ahead of the Shenzhou-12 mission to build China's space station, near Jiuquan, Gansu province, China June 16, 2021.

The Long March-2F Y12 rocket, carrying the Shenzhou-12 spacecraft and three astronauts, takes off from Jiuquan Satellite Launch Center for China's first manned mission to build its space station, near Jiuquan, Gansu province, China June 17, 2021.

The Long March-2F Y12 rocket, carrying the Shenzhou-12 spacecraft and three astronauts, takes off from Jiuquan Satellite Launch Center for China's first manned mission to build its space station, near Jiuquan, Gansu province, China June 17, 2021.

Chinese astronauts Nie Haisheng, Liu Boming, and Tang Hongbo wave as they meet members of the media behind a glass wall before the Shenzhou-12 mission to build China's space station, at Jiuquan Satellite Launch Center near Jiuquan, Gansu province, China June 16, 2021.

Image used for illustrative purpose. The Long March-2F Y12 rocket, carrying the Shenzhou-12 spacecraft and three astronauts, takes off from Jiuquan Satellite Launch Center for China's first manned mission to build its space station, near Jiuquan, Gansu province, China June 17, 2021.

Chinese astronauts Tang Hongbo, Nie Haisheng and Liu Boming salute before the launch of the Long March-2F Y12 rocket, carrying the Shenzhou-12 spacecraft and the three astronauts, from Jiuquan Satellite Launch Center for China's first manned mission to build its space station, near Jiuquan, Gansu province, China June 17, 2021.

Chinese astronauts Nie Haisheng, Liu Boming, and Tang Hongbo meet members of the media behind a glass wall before the Shenzhou-12 mission to build China's space station, at Jiuquan Satellite Launch Center near Jiuquan, Gansu province, China June 16, 2021.

The Long March-2F Y12 rocket, carrying the Shenzhou-12 spacecraft and three astronauts, takes off from Jiuquan Satellite Launch Center for China's first manned mission to build its space station, near Jiuquan, Gansu province, China June 17, 2021.

The Long March-2F Y12 rocket, carrying the Shenzhou-12 spacecraft and three astronauts, takes off from Jiuquan Satellite Launch Center for China's first manned mission to build its space station, near Jiuquan, Gansu province, China June 17, 2021.

Chinese astronauts Nie Haisheng, Liu Boming, and Tang Hongbo meet members of the media behind a glass wall before the Shenzhou-12 mission to build China's space station, at Jiuquan Satellite Launch Center near Jiuquan, Gansu province, China June 16, 2021.

The Long March-2F Y12 rocket, carrying the Shenzhou-12 spacecraft and three astronauts, takes off from Jiuquan Satellite Launch Center for China's first manned mission to build its space station, near Jiuquan, Gansu province, China June 17, 2021.

A badge of the Shenzhou-12 Manned Space Flight Mission is seen on the uniform of a staff member of the Jiuquan Satellite Launch Center during a news conference before the Shenzhou-12 mission to build China's space station, at Jiuquan Satellite Launch Center in Gansu province, China June 16, 2021.

The Long March-2F Y12 rocket, carrying the Shenzhou-12 spacecraft and three astronauts, takes off from Jiuquan Satellite Launch Center for China's first manned mission to build its space station, near Jiuquan, Gansu province, China June 17, 2021.

Staff members of the Jiuquan Satellite Launch Center attend a news conference before the Shenzhou-12 mission to build China's space station, at Jiuquan Satellite Launch Center in Gansu province, China June 16, 2021.

Staff members of the Jiuquan Satellite Launch Center attend a news conference before the Shenzhou-12 mission to build China's space station, at Jiuquan Satellite Launch Center in Gansu province, China June 16, 2021.

The Long March-2F Y12 rocket, carrying the Shenzhou-12 spacecraft and three astronauts, takes off from Jiuquan Satellite Launch Center for China's first manned mission to build its space station, near Jiuquan, Gansu province, China June 17, 2021.

The launch pad for the Long March-2F Y12 rocket is seen at Jiuquan Satellite Launch Center ahead of the Shenzhou-12 mission to build China's space station, near Jiuquan, Gansu province, China June 16, 2021.