Photo taken on July 27, 2019 shows the starry night over the Ming'antu observing station of the National Astronomical Observatories of the Chinese Academy of Sciences, in Zhengxiangbai Qi, north China's Inner Mongolia Autonomous Region. (Xinhua/Liu Lei)

Photo taken on July 26, 2019 shows the starry night over the Ming'antu observing station of the National Astronomical Observatories of the Chinese Academy of Sciences, in Zhengxiangbai Qi, north China's Inner Mongolia Autonomous Region. (Xinhua/Ren Junchuan)

Photo taken on July 26, 2019 shows the starry night over the Ming'antu observing station of the National Astronomical Observatories of the Chinese Academy of Sciences, in Zhengxiangbai Qi, north China's Inner Mongolia Autonomous Region. (Xinhua/Ren Junchuan)

Photo taken on July 26, 2019 shows the starry night over the Ming'antu observing station of the National Astronomical Observatories of the Chinese Academy of Sciences, in Zhengxiangbai Qi, north China's Inner Mongolia Autonomous Region. (Xinhua/Ren Junchuan)

Photo taken on July 26, 2019 shows the starry night over the Ming'antu observing station of the National Astronomical Observatories of the Chinese Academy of Sciences, in Zhengxiangbai Qi, north China's Inner Mongolia Autonomous Region. (Xinhua/Ren Junchuan)

Photo taken on July 27, 2019 shows the starry night over the Ming'antu observing station of the National Astronomical Observatories of the Chinese Academy of Sciences, in Zhengxiangbai Qi, north China's Inner Mongolia Autonomous Region. (Xinhua/Liu Lei)

Photo taken on July 26, 2019 shows the starry night over the Ming'antu observing station of the National Astronomical Observatories of the Chinese Academy of Sciences, in Zhengxiangbai Qi, north China's Inner Mongolia Autonomous Region. (Xinhua/Ren Junchuan)