Astronaut Quote by Enrico Fermi

We stand on a great threshold in the human history of space exploration. If life is prevalent in our neighborhood of the galaxy, it…

— Sara Seager

“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

While human space travel is daunting, machines - with their indefinitely long lifetimes - could travel the galaxy. It might make little difference to…

— Seth Shostak

“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

I have never really got used to being on this earth. Sometimes I think our presence here is due to a cosmic blunder, that…

— John Banville

Space doesn't offer an escape from Earth's problems. And even with nuclear fuel, the transit time to nearby stars exceeds a human lifetime. Interstellar…

— Martin Rees

“The Cosmos extends, for all practical purposes, forever. After a brief and sedentary hiatus we are resuming our ancient nomadic way of life. Our…

— Carl Sagan

It's not going to be just humans colonizing space, it's going to be life moving out from the Earth, moving it into its kingdom.…

— Freeman Dyson

For most of us, the thought of traveling to another galaxy probably seems like science fiction. But the truth is, the foundation for humankind's…

— Victor J. Glover

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

— Stephen Hawking

I think we're a long ways from really putting colonies of people out there who would live their whole lives out there in space.…

— John Glenn