![Dunhuang city in Northwest China\'s Gansu province, is brightened by stars when the nights falls in May, 2019. (Photo/VCG)](http://www.ecns.cn/hd/2019/05/30/7d836feea465423c8c556cac6e715e20.jpg)
Dunhuang city in Northwest China's Gansu province, is brightened by stars when the nights falls in May, 2019. (Photo/VCG)
![Dunhuang city in Northwest China\'s Gansu province, is brightened by stars when the nights falls in May, 2019. (Photo/VCG)](http://www.ecns.cn/hd/2019/05/30/77a8702759884b87b3b7cc6656e9ad4f.jpg)
Dunhuang city in Northwest China's Gansu province, is brightened by stars when the nights falls in May, 2019. (Photo/VCG)
![Dunhuang city in Northwest China\'s Gansu province, is brightened by stars when the nights falls in May, 2019. (Photo/VCG)](http://www.ecns.cn/hd/2019/05/30/7cd2386baa8346ba8382930016ecb2ad.jpg)
Dunhuang city in Northwest China's Gansu province, is brightened by stars when the nights falls in May, 2019. (Photo/VCG)