Alive Quote by Carl Sagan

Since, in the long run, every planetary civilization will be endangered by impacts from space, every surviving civilization is obliged to become spacefaring--not because…

— Carl Sagan

Our only chance of long-term survival is not to remain lurking on planet Earth, but to spread out into space.

— Stephen Hawking

Space travel leading to skylife is vital to human survival, because the question is not whether we will be hit by an asteroid, but…

— Gregory Benford

If we can avoid disaster for the next two centuries, our species should be safe as we spread into space. If we are the…

— Stephen Hawking

If we move toward the weaponisation of space, we can bid farewell to the planet. The chances of survival are very slight.

— Noam Chomsky

I believe that the long-term future of the human race must be space and that it represents an important life insurance for our future…

— Stephen Hawking

“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

All civilizations become either spacefaring or extinct.

— Carl Sagan

Life on Earth is at the ever-increasing risk of being wiped out by a disaster, such as sudden global warming, nuclear war, a genetically…

— Stephen Hawking

Now, more than ever, we need people in space... The events of September 11 show us how vulnerable we and our civilization are down…

— Paul Levinson

Life on Earth is at an ever-increasing risk of being wiped out by disaster. ... I think the human race doesn't have a future…

— Peter Diamandis

The conquest of space is worth the risk of life.

— Gus Grissom