Civilization Quote by Carl Sagan

The evidence that at least one extraterrestrial civilization has visited Earth is extensive both in scope and detail. In its totality it comprises a…

— Steven M. Greer

After investigating the UFO phenomenon all over the world, after studying thousands of pages of released government documents, and interviewing eyewitnesses and insiders, including…

— Michael Hesemann

I'm skeptical of claims that we've been visited by aliens from another planet or other dimension, but I don't rule it out 100 percent.…

— Leroy Chiao

“We live in a world where extraterrestrials could be everywhere and you would never know. A world driven by god’s, unexplained structures, countless stories…

— Michael E Emmering

Nobody has ever convinced me that ancient aliens have visited Earth. Not even close.

— Dan Brown

I look at the extraterrestrial subject as phenomenally interesting.

— Robert Bigelow

“Early SETI efforts were marked by overly optimistic estimates of the probable number of extraterrestrial civilizations in our galaxy. In light of new findings…

— Peter Schenkel

Many researchers do feel that humankind may have to face another Great Cleansing, such as the Great Flood of world mythology. Again, numerous UFO…

— Brad Steiger

For years I've been stressing with regard to UFOs that extraordinary claims require extraordinary evidence.

— Carl Sagan

After a lifetime in this subject, I have concluded that the extraterrestrial hypothesis is one reasonable tentative approach to putting the best-documented and most…

— Jerome Clark

I'm of the opinion that it flies in the face of reason not to believe. The odds are too great against you to not…

— John de Lancie

There is no doubt in my mind, after 37 years of study and investigation that the evidence is overwhelming that planet Earth is being…

— Stanton T. Friedman