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" "Don’t you ever feel . . . lost in your universe? How do you know what to do, how to behave, if there’s no God? Just obey the law or get arrested?” “You’re not worried about being lost, Palmer. You’re worried about not being central, not the reason the universe was created.
Carl Edward Sagan (9 November 1934 – 20 December 1996) was an American astronomer, planetary scientist, cosmologist, astrophysicist, astrobiologist, author, and science communicator. His best known scientific contribution is research on extraterrestrial life, including experimental demonstration of the production of amino acids from basic chemicals by radiation. Sagan assembled the first physical messages sent into space, the Pioneer plaque and the Voyager Golden Record, universal messages that could potentially be understood by any extraterrestrial intelligence that might find them. Sagan argued the hypothesis, accepted since, that the high surface temperatures of Venus can be attributed to, and calculated using, the greenhouse effect. He testified to the US Congress in 1985 that the greenhouse effect will change the earth's climate system.
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Kao što stari mitovi govore, mi smo jednako djeca neba i Zemlje. Kroz vrijeme svog boravka na ovom planetu sakupili smo opasno evolucijsko breme, naslijeđene sklonosti prema agresiji i ritualu, podčinjavanje vođama, mržnju prema strancima, što sve sada dovodi u pitanje naše preživljavanje. Ali stekli smo suosjećanje za druge, ljubav prema djeci i djeci naše djece, želju da učimo iz povijesti i uzvišenu strastvenu inteligenciju – očito oružje našeg preživljavanja i napretka. Koji će oblici naše prirode prevladati nesigurno je, posebno ako su naši pogledi, razumijevanje i vidici vezani isključivo za Zemlju – ili, još gore, za jedan mali dio nje. Ali tamo gore u beskraju svemira očekuje nas neizbježna budućnost. Za sada nema još nikakvih sigurnih signala izvanzemaljske inteligencije i stoga se pitamo da li civilizacije poput naše uvijek srljaju neumoljivo, nepromišljeno, prema samouništenju. Nacionalne granice su nezamjetljive kada Zemlju gledamo iz prostora. Fanatični etnički, religijski, nacionalni šovinizmi teško se mogu održati kada promatramo naš planet kao nježan plavi polumjesec kako se gasi poput sve slabije točke svjetlosti usred zvjezdanog tkanja. Putovanja proširuju vidike.
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Had your spacecraft flown by the Earth a hundred million years ago, in the age of the dinosaurs when there were no humans and no technology, you would still have seen oxygen and ozone, the chlorophyll pigment, and far too much methane. At present, though, your instruments are finding signs not just of life, but of high technology — something that couldn’t possibly have been detected even a hundred years ago: You are detecting a particular kind of radio wave emanating from Earth. Radio waves don’t necessarily signify life and intelligence. Many natural processes generate them. You’ve already found radio emissions from other, apparently uninhabited worlds — generated by electrons trapped in the strong magnetic fields of planets, by chaotic motions at the shock front that separates these magnetic fields from the interplanetary magnetic field, and by lightning.