ABSTRACT
Orthodox scientific opinion, including that of SETI researchers, totally rejects accounts of visits to Earth by extraterrestrials. Few scientists are willing to bestow credibility on theories which purport to explain how extraterrestrials could visit us, and the branch of investigation known as Ufology is branded as pseudoscientific nonsense. Yet belief in alien visits, in flying saucers, contacts and abductions, has a vast public following, and discussion of UFOs is, perhaps, the public’s first introduction to the subject of extraterrestrial life. This chapter examines purported evidence of UFO visits and various reports of encounters with extraterrestrials.
