Civilization Quote by Neil deGrasse Tyson

In the vastness of the Cosmos there must be other civilizations far older and more advanced than ours.

— Carl Sagan

Statistically it's a certainty there are hugely advanced civilizations, intelligences, life forms out there. I believe they're so advanced they're even doing interstellar travel.…

— Story Musgrave

Intelligence may indeed be a benign influence creating isolated groups of philosopher-kings far apart in the heavens... On the other hand, intelligence may be…

— Freeman Dyson

The fact that we have not yet found the slightest evidence for life - much less intelligence - beyond this Earth does not surprise…

— Arthur C. Clarke

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

It is an odd fact of evolution that we are the only species on Earth capable of creating science and philosophy. There easily could…

— Colin McGinn

We only have to look at ourselves to see how intelligent life might develop into something we wouldnt want to meet. I imagine they…

— Stephen Hawking

“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

“On Earth, humankind can step onto another continent, and without a thought, destroy the kindred civilizations found there through warfare and disease. But when…

— Liu Cixin

What then is the intellectual advantage of civilization over primitive savagery? It is not necessarily that each civilized man has more knowledge but that…

— Thomas Sowell

It must be a very dour and pessimistic astronomer indeed who seriously doubts that there must be countless numbers of intelligent civilizations scattered throughout…

— Robert K. G. Temple

Why should we consider defining intelligence as something global and as something that hasn't actually yet appeared on Earth? It may be useful for…

— David Grinspoon