CSETI (The Center for the Study of Extraterrestrial…

The evidence is overwhelming that Planet Earth is being visited by intelligently controlled extraterrestrial spacecraft. In other words, SOME UFOs are alien spacecraft. Most…

— Stanton T. Friedman

“We have no certainty we’ll contact extraterrestrial beings from one of the billion earthlike planets in the sky in the next 200 years, but…

— Kevin Kelly

A contact with an extraterrestrial civilization is the greatest challenge for mankind in the Third Millennium. We would finally realize that we are indeed…

— Michael Hesemann

There are more than 100 first- and second- hand witnesses to the retrieval of an extraterrestrial spacecraft and at least four extraterrestrial bodies from…

— Steven M. Greer

There are hundreds of electromagnetic cases where spacecraft have been observed by police, military personnel and civilians to affect car engines, radios and other…

— Steven M. Greer

There are hundreds of credible reports, many with multiple witnesses, of humanoids in association with landed spacecraft.

— Steven M. Greer

There are several multiple-witnessed events where humans have been taken on board spacecraft.

— Steven M. Greer

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…

— Steven M. Greer

Extraterrestrial intelligence could have sent DNA-seed packets out through space to plant life on hospitable planets such as earth.

— Timothy Leary

“I'm frequently asked, "Do you believe there's extraterrestrial intelligence?" I give the standard arguments- there are a lot of places out there, the molecules…

— Carl Sagan

“My conclusion is a startling one. I think it very likely—in fact inevitable—that biological intelligence is only a transitory phenomenon, a fleeting phase in…

— Paul Davies

“We humans, as species, are interested in communication with extraterrestrial intelligence. Would not a good beginning be improved communication with terrestral intelligence, with other…

— Carl Sagan

"I know perfectly well that at this moment the whole universe is listening to us," Jean Giraudoux wrote in The Madwoman of Chaillot, "and…

— Frank Drake

Clearly, unless thinking beings inevitably wipe themselves out soon after developing technology, extraterrestrial intelligence could often be millions or billions of years in advance…

— Seth Shostak

Once He created the Big Bang... He could have envisioned it going in billions of directions as it evolved, including billions of life-forms and…

— Theodore Hesburgh