Wang Sichao, a researcher and planetary astronomer at the Purple Hills Observatory of the Chinese Academy of Sciences, said that he believes extraterrestrial beings do exist and their UFOs have the ability to visit our earth. However, he disagrees with British scientist Stephen Hawking, who believes an encounter with aliens would spell disaster to human beings.

Wang has done the astronomical observation work for 39 years and he publicized his opinion on a science forum held in Guangzhou today.