Civilization Quote by Robert K. G. Temple

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

— Carl Sagan

There are 400 billion stars out there, just in our galaxy alone. If just one out of a million of those had planets, and…

— Jodie Foster

My only hope is that every other alien civilization isn't doing exactly what we are doing because then everybody would be listening, nobody would…

— Neil deGrasse Tyson

The human race may be the only intelligent beings in the galaxy.

— Stephen Hawking

“The Cosmos may be densely populated with intelligent beings. But the Darwinian lesson is clear: There will be no humans elsewhere. Only here. Only…

— Carl Sagan

“There will be no humans elsewhere. Only here. Only on this small planet. We are a rare as well as an endangered species. Every…

— Anonymous

There must be enormous numbers of planets around the stars in the many galaxies in our observable universe. We may be sure that wonderful…

— Jim Peebles

“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

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

People quite often think of the question 'Are we alone in the universe?' in terms of other civilizations out there: life forms that have…

— Dimitar Sasselov

“One consequence of this train of argument is that, even if civilizations commonly arise on planets throughout the Galaxy, few of them will be…

— 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