The evidence that at least one extraterrestrial civilization has visited Earth is extensive both in scope and detail. In its totality it comprises a body of evidence which at the very least supports the general assessment that extraterrestrial life has been detected, and that a vigorous program of research and serious diplomatic initiatives is warranted. Consider the following overview of facts:
• There are numerous daytime and night time photographs and videotapes of clearly non-human spacecraft from all over the world; these films and videotapes have been evaluated and deemed authentic by competent experts in optical physics and related fields.
• There are more than 3500 military and commercial aircraft pilot reports of encounters worldwide; many cases have corroborating radar documentation and multiple witnesses both on the ground and in the air.