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[on the possibility of contact with an alien civilization] I think it would be a disaster. The extraterrestrials would probably be far in advance of us. The history of advanced races meeting more primitive people on this planet is not very happy, and they were the same species. I think we should keep our heads low.
--
From an appearance in the National Geographic Channel program Naked Science: Alien Contact, as quoted in The New York Times (24 November 2004) and a CNN transcript of an interview with Seth Shostak from Anderson Cooper 360 (26 November 2004)

 

Stephen Hawking

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When, in the slow procession of the ages, man was developed on this planet, the change worked by his appearance was at first slight. Further ages passed while he groped and struggled by infinitesimal degrees upward through the lower grades of savagery; for the general law is that life which is advanced and complex, whatever its nature, changes more quickly than simpler and less advanced forms. The life of savages changes and advances with extreme slowness, and groups of savages influence one another but little. The first rudimentary beginnings of that complex life of communities which we call civilization marked a period when man had already long been by far the most important creature on the planet. The history of the living world had become, in fact, the history of man, and therefore something totally different in kind as well as in degree from what it had been before.

 

Theodore Roosevelt

 

Al-Buraq to Earth. Contact made. Kamal, onboard computer, setting up link between (1) mind of mixed-species hominid on Planet Earth, and (2) cortico helmet of Captain Jul. Scanning planet for mixed-species hominid. One mixed-species hominid identified. Name: Yakoub Islam. Consent obtained. Link established with Yakoub’s mind.
Set up complete.

 

Yakoub Islam

 

The disastrous feature of our civilization is that it is far more developed materially than spiritually. Its balance is disturbed ... Now come the facts to summon us to reflect. They tell us in terribly harsh language that a civilization which develops only on its material side, and not in the sphere of the spirit ... heads for disaster.

 

Albert Schweitzer

 

I'm a long-haul Cosmic anthropologist, which means I hop around isolate-planets (like Earth) in order to study Advanced Language Species (like homo sapiens). I specialise in First Stage Globalization (FSG) terrestrials. Most FSG planets have whole-world silicon-based communication technologies in situ, and thus as soon as I’m near enough, I ’plug in’, and shortly after make contact. Well, I’ve been plugged in for quite some time, but this is my first contact. Sorry about that.

 

Yakoub Islam

 

Those worlds in space are as countless as all the grains of sand on all the beaches of the earth. Each of those worlds is as real as ours and every one of them is a succession of incidents, events, occurrences which influence its future. Countless worlds, numberless moments, an immensity of space and time. And our small planet at this moment, here we face a critical branch point in history, what we do with our world, right now, will propagate down through the centuries and powerfully affect the destiny of our descendants, it is well within our power to destroy our civilization and perhaps our species as well. If we capitulate to superstition or greed or stupidity we could plunge our world into a time of darkness deeper than the time between the collapse of classical civilization and the Italian Renaissance. But we are also capable of using our compassion and our intelligence, our technology and our wealth to make an abundant and meaningful life for every inhabitant of this planet.

 

Carl Sagan