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.
Wang also found that in the terrestrial space between the height of 130 kilometers and 1,500 kilometers, UFOs have appeared many times. Their flying speed is much slower than the first cosmic velocity. Some are even as slow as 0.29 kilometers per second and they can fly in the 1,460 kilometers' height for more than 25 minutes.