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It seems to me what is called for is an exquisite balance between two conflicting needs: the most skeptical scrutiny of all hypotheses that are serve… - Carl Sagan
" "It seems to me what is called for is an exquisite balance between two conflicting needs: the most skeptical scrutiny of all hypotheses that are served up to us and at the same time a great openness to new ideas. If you are only skeptical, then no new ideas make it through to you. You never learn anything new. You become a crotchety old person convinced that nonsense is ruling the world. (There is, of course, much data to support you.)
On the other hand, if you are open to the point of gullibility and have not an ounce of sceptical sense in you, then you cannot distinguish useful ideas from the worthless ones. If all ideas have equal validity then you are lost, because then, it seems to me, no ideas have any validity at all.
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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.
Biography information from Wikiquote
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Carl Edward 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 CE
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Additional quotes by Carl Sagan
La Unión Soviética se anexionó por la fuerza Letonia, Lituania, Estonia y partes de Finlandia, Polonia y Rumania; ocupó y sometió a un régimen comunista a Polonia, Rumania, Hungría, Mongolia, Bulgaria, Checoslovaquia, Alemania oriental y Afganistán, y sofocó el alzamiento de los obreros de Alemania oriental en 1953, la revolución húngara de 1956 y la tentativa checa de introducir en 1968 el glasnost y la perestroika. Dejando aparte las guerras mundiales y las expediciones para combatir la piratería o el tráfico de esclavos, Estados Unidos ha perpetrado invasiones e intervenciones armadas en otros países en más de 130 ocasiones*, incluyendo China (18 veces), México (13), Nicaragua y Panamá (9 cada uno), Honduras (7), Colombia y Turquía (6 en cada país), República Dominicana, Corea y Japón (5 cada uno), Argentina, Cuba, Haití, el reino de Hawai y Samoa (4 cada uno), Uruguay y Fiji (3 cada uno), Granada, Puerto Rico, Brasil, Chile, Marruecos, Egipto, Costa de Marfil, Siria, Irak, Perú, Formosa, Filipinas, Camboya, Laos y Vietnam. La mayoría de estas incursiones han sido escaramuzas para mantener gobiernos sumisos o proteger propiedades e intereses de empresas estadounidenses, pero algunas han sido mucho más importantes, prolongadas y cruentas.
* Esta lista, que suscitó una cierta sorpresa cuando fue publicada en Estados Unidos, se basa en recopilaciones de la Comisión de fuerzas armadas de la cámara de representantes.
When an object impacts the Moon at high speed, it sets the Moon slightly wobbling. Eventually the vibrations die down but not in so short a period as eight hundred years. Such a quivering can be studied by laser reflection techniques. The Apollo astronauts emplaced in several locales on the Moon special mirrors called laser retroreflectors. When a laser beam from Earth strikes the mirror and bounces back, the round-trip travel time can be measured with remarkable precision. This time multiplied by the speed of light gives us the distance to the Moon at that moment to equally remarkable precision. Such measurements, performed over a period of years, reveal the Moon to be librating, or quivering with a period (about three years) and amplitude (about three meters), consistent with the idea that the crater Giordano Bruno was gouged out less than a thousand years ago.
One of the reasons for its success is that science has a built-in, error-correcting machinery at its very heart. Some may consider this an overbroad characterization, but to me every time we exercise self-criticism, every time we test our ideas against the outside world, we are doing science. When we are self-indulgent and uncritical, when we confuse hopes and facts, we slide into pseudoscience and superstition.
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