1、When He Zhongyuan took the photo at river in Chongqing, the UFO image in the photograph taken at river in Chongqing. How did He Zhongyuan take this photo? In fact the ghost image is created by the optical system of the receptor or detector. 2、When we discuss the pollution sociate with urban development one of the hardest problem is increasing mount electric lighting. It is estimated that the sky brightness increases by 5% each year. If it gets worse, it will definitely reduce scientific output.