Nick Sagan Quotes

Where there's water on Earth, you find life as we know it. So if you find water somewhere else, it becomes a remarkable draw to look closer to see if life of any kind is there, even if it's bacterial, which would be extraordinary for the field of biology.

I think there must be some other life forms, even if they're microscopic.

People quite often think of the question 'Are we alone in the universe?' in terms of other civilizations out there: life forms that have reached at least our level of technological development.

I believe that there may be intelligent life on other planets.

I actually think the chances that we'll find E.T. are pretty good.

With 'Extinction Machine,' I wanted to start some conversations about whether we're alone in the universe and what that might mean.

I believe alien life is quite common in the universe, although intelligent life is less so. Some say it has yet to appear on planet Earth.

We're going to understand that there is life on other bodies in the solar system.

How can the human race be, like, the only living form in the universe? There have to be other life forms out there. I believe it.

It's presumptuous for us to think we are the only beings in the cosmos.

Life outside of Earth is probably going to be really hard to find.

Theoretically, there are planets with an environment that can support life. As yet there is no evidence that there indeed is life on other planets. It's only a matter of time before we get to know.

Our field is very focused on finding Earth 2.0, and anything we can do to narrow the search is helpful.

The existence of life beyond Earth is an ancient human concern. Over the years, however, attempts to understand humanity's place in the cosmos through science often got hijacked by wishful thinking or fabricated tales.

For many centuries, humans have speculated that there might be planetary systems around other stars and that there could be extraterrestrial life there and even intelligent being. However, those were simply speculations, and now we have evidence for the first part of these ideas.

We're all interested in life outside of Earth. We all have a fascination with what's out there because we don't really know.

The belief that there are other life forms in the universe is a matter of faith. There is not a single shred of evidence for any other life forms, and in forty years of searching, none has been discovered. There is absolutely no evidentiary reason to maintain this belief.

Maybe the search for life shouldn't restrict attention to planets like Earth. Science fiction writers have other ideas: balloon-like creatures floating in the dense atmospheres of planets such as Jupiter, swarms of intelligent insects, nano-scale robots and more.

We can never prove that we're alone in the universe. But the Allen Telescope Array could prove that we're not.

I haven't a clue if there is life on other planets but I'd be charmed if we found a unicellular organism on Mars. It would change our whole concept of life on Earth.

Wonder if there is life on another planet? Let's suppose there is. Suppose further, that only one star in a trillion has a planet that could support life. If that were the case, then there would be at least 100 million planets that harbored life.

Mars is the only place in the solar system where it's possible for life to become multi-planetarian.

What we expect to find, certainly in our own solar system, are probably simple single or multiple-cell forms of life. To get to intelligent life takes stability of conditions over huge, long periods of time.

I don't think we are the only planet that has life.

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