“[In the Universe it may be that] Primitive life is very common and intelligent life is fairly rare. Some would say it has yet to occur on Earth.”

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Stephen Hawking122

British theoretical physicist, cosmologist, and author 1942–2018

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“It is very likely that there are many, many planets carrying life, even intelligent life, throughout the universe, because there are so many stars. By sheer chance, even if those chances are small, a great many life forms and a great many intelligences may exist.”

Isaac Asimov (1920–1992) American writer and professor of biochemistry at Boston University, known for his works of science fiction …

Interview http://americanindian.net/asimov.html in Southwest Airlines Magazine 1979) <br class="br">General sources

“Biology is the scientific study of life - in principle, anyway. In practice, biology is the scientific study of life on Earth based on carbon-chain chemistry. There is nothing in its charter that restricts biology to carbon-based life; it is simply that this is the only kind of life that has been available to study. Thus, theoretical biology has long faced the fundamental obstacle that it is impossible to derive general principles from single examples… Without other examples, it is difficult to distinguish essential properties of life - properties that would be shared by any living system - from properties that may be incidental to life in principle, but which happen to be universal to life on Earth due solely to a combination of local historical accident and common genetic descent.”

Christopher Langton (1949) American computer scientist

Source: Artificial Life (1989), p.2

“The surest sign that intelligent life exists elsewhere in the universe is that it has never tried to contact us.”

Bill Watterson (1958) American comic artist

The Indispensable Calvin and Hobbes

“The fact that we have not yet found the slightest evidence for life — much less intelligence — beyond this Earth does not surprise or disappoint me in the least. Our technology must still be laughably primitive, we may be like jungle savages listening for the throbbing of tom-toms while the ether around them carries more words per second than they could utter in a lifetime.”

Arthur C. Clarke (1917–2008) British science fiction writer, science writer, inventor, undersea explorer, and television series host

"Credo" (1991); also in Greetings, Carbon-Based Bipeds! : Collected Essays, 1934-1998 (1999), p. 360
1990s

“No human society is too primitive to have some kind of literature. The only thing is that primitive literature hasn't yet become distinguished from other aspects of life: it's still embedded in religion, magic and social ceremonies.”

Northrop Frye (1912–1991) Canadian literary critic and literary theorist

"Quotes", The Educated Imagination (1963), Talk 2: The Singing School

“The past and present events in the Universe point towards the fact that the extinction of humans, or any other potential intelligent life, in this space desert is a common physical phenomenon.”

Zafar Mirzo (1972)

“Appeal to ignorance — the claim that whatever has not been proved false must be true, and vice versa (e. g. There is no compelling evidence that UFOs are not visiting the Earth; therefore UFOs exist — and there is intelligent life elsewhere in the universe. Or: There may be seventy kazillion other worlds, but not one is known to have the moral advancement of the Earth, so we're still central to the Universe.) This impatience with ambiguity can be criticized in the phrase: absence of evidence is not evidence of absence.”

Carl Sagan (1934–1996) American astrophysicist, cosmologist, author and science educator

Referring to an aphorism of Martin Rees. (see Misattributed below)
Source: The Demon-Haunted World : Science as a Candle in the Dark (1995), Ch. 12 : The Fine Art of Baloney Detection, p. 221

“When I talk of the purpose of life, I am thinking not only of human life, but of all life on Earth and of the life which must exist upon other planets throughout the universe. It is only of life on Earth, however, that one can speak with any certainty. It seems to me that all life on Earth, the sum total of life upon the Earth, has purpose.”

Clifford D. Simak (1904–1988) American writer, journalist

Interview in Speaking of Science Fiction: The Paul Walker Interviews (1978)
Context: When I talk of the purpose of life, I am thinking not only of human life, but of all life on Earth and of the life which must exist upon other planets throughout the universe. It is only of life on Earth, however, that one can speak with any certainty. It seems to me that all life on Earth, the sum total of life upon the Earth, has purpose. If the means were available, we could trace our ancestry — yours and mine — back to the first blob of life-like material that came into being on the planet. The same thing could be done for the spider that spun his web in the grass, and of the grass in which the web was spun, the bird sitting in the tree and the tree in which he sits, the toad waiting for the fly beneath the bush, and for the fly and bush. We are all genetic brothers. The chain of life, tracing back to that primordial day of life's beginning, is unbroken...

“Look at the solar system, and look at the Earth. On Earth, there are many intelligent species, but only one has achieved technology. Right here in the journey of our own solar system, there is a very, very powerful message that says here's how we should look for alien life, small and big. So yeah, microbes are talking and we are listening, and they are taking us, one planet at a time and one moon at a time, towards their big brothers out there. And they are telling us about diversity, they are telling us about abundance of life, and they are telling us how this life has survived thus far to reach civilization, intelligence, technology and, indeed, philosophy.”

Nathalie Cabrol (1963) French American astrobiologist

Source: How Mars might hold the secret to the origin of life https://www.ted.com/talks/nathalie_cabrol_how_mars_might_hold_the_secret_to_the_origin_of_life (March 2015)

“Let us beware of saying that death is the opposite of life. The living being is only a species of the dead, and a very rare species.”

Friedrich Nietzsche (1844–1900) German philosopher, poet, composer, cultural critic, and classical philologist

Source: The Gay Science

“[In the Universe it may be that] Primitive life is very common and intelligent life is fairly rare. Some would say it has yet to occur on Earth.”

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