The near side of a galaxy is tens of thousands of light-years closer to us than the far side; thus we see the front as it was tens of thousands of ye… - Carl Sagan
" "The near side of a galaxy is tens of thousands of light-years closer to us than the far side; thus we see the front as it was tens of thousands of years before the back. But typical events in galactic dynamics occupy tens of millions of years, so the error in thinking of an image of a galaxy as frozen in one moment of time is small.
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About Carl Sagan
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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Also Known As
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Carl Edward Sagan
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Sagan
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Carl E. Sagan
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Carl E Sagan
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C. E. Sagan
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C.E. Sagan
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C E Sagan
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C. Sagan
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C Sagan
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Sagan C
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Sagan C.
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Sagan C. E.
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Sagan CE
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Additional quotes by Carl Sagan
Toen onze genen niet meer alle informatie konden opslaan die nodig was om te overleven, vonden we langzamerhand de hersenen uit. Maar toen kwam de tijd, misschien 10.000 jaar geleden, dat we meer moesten weten dan de hersenen gevoeglijk konden bevatten. Dus leerden we enorme hoeveelheden informatie buiten ons lichaam op te slaan. Wij zijn voor zover we weten de enige soort op onze planeet die een gemeenschappelijk geheugen heeft uitgevonden dat noch in onze genen noch in onze hersenen zetelt. De opslagplaats van dat geheugen wordt bibliotheek genoemd.
Een boek wordt gemaakt van een boom. Het is een verzameling vlakke, buigzame delen (nog steeds 'bladen' genoemd), bedrukt met donker gekleurde kriebels. Eén oogopslag en je hoort de stem van iemand anders - misschien een persoon die al duizenden jaren dood is. Millennia na dato spreekt de schrijver, duidelijk en zwijgend, binnen in ons hoofd. De schrijfkunst is misschien wel de grootste van alle menselijke vindingen; ze bindt mensen te zamen, bewoners van ver verwijderde tijdperken die elkaar nooit hebben gekend. Boeken verbreken de kluisters van de tijd, een bewijs dat de mens een tovenaar kan zijn.
Human DNA is a ladder a billion nucleotides long. Most possible combinations of nucleotides are nonsense; they would cause the synthesis of proteins that perform no useful function. Only an extremely limited number of nucleic acid molecules are any good for lifeforms as complicated as we. Even so, the number of useful ways of putting nucleic acids together is stupefyingly large- probably far greater than the total number of electrons and protons in the universe. Accordingly, the number of possible individual human beings is vastly greater than the number that have ever lived: the untapped potential of the human species is immense. There must be ways of putting nucleic acids together that will function far better- by any criterion we choose- than any human being who has ever lived. p26
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How thoroughly the chimps and bonobos have erased the list of purported human distinctions!-self-awareness, language, ideas and their association, reason, trade, play, choice, courage, love and altruism, laughter, concealed ovulation, kissing, face-to-face sex, female orgasm, division of labor, cannibalism, art, music, politics, and featherless bipedalism, besides tool using, tool making, and much else. Philosophers and scientists confidently offer up traits said to be uniquely human, and the apes casually knock them down — toppling the pretension that humans constitute some sort of biological aristocracy among the beings of Earth. Instead, we are more like the nouveau riche, incompletely accommodated to our recent exalted state, insecure about who we are, and trying to put as much distance as possible between us and our humble origins. It's as if our nearest relatives, by their very existence, refute all our explanations and justifications. So as counterweights to human arrogance and pride, it is good for us that there are still apes on Earth.
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