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 Décryptage des messages

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Mustard
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MessageSujet: Décryptage des messages   Ven 28 Sep 2007 - 18:24

Voici un des messages laissé sur Voyager 1 et 2 dans le cas où une autre race ET tomberait dessus.
Personnellement j'ai toujours trouvé l'implantation d'un tel message sans fondement car si une race ET arrive à contruire des vaisseaux, croiser dans les parrages de notre système solaire, il n'aura sans aucun doute détecté notre activité et présence depuis longtemps.
Mais boin, un peu de rêve ne fait pas de mal après tout.


Ce qui serait amusant, ce serait de savoir si nous, homme de la terre, de ce forum, serions capable de le comprendre car franchement ça n'a pas l'air si simple.
J'attend donc vos suggestions.


Explanation: Launched thirty years ago, NASA's Voyager 1 and 2 spacecraft are now respectively 15 and 12.5 billion kilometers from the Sun, equivalent to about 14 and 11.5 light-hours distant. Still functioning, the Voyagers are being tracked and commanded through the Deep Space Network. Having traveled beyond the outer planets, they are only the third and fourth spacecraft from planet Earth to escape toward interstellar space, following in the footsteps of Pioneer 10 and 11. A 12-inch gold plated copper disk (a phonograph record) containing recorded sounds and images representing human cultures and life on Earth, is affixed to each Voyager - a message in a bottle cast into the cosmic sea. The recorded material was selected by a committee chaired by astronomer Carl Sagan. Simple diagrams on the cover symbolically represent the spacecraft's origin and give instructions for playing the disk. The exotic construction of the disks should provide them with a long lifetime as they coast through interstellar space.


En bas à droite je crois que c'est l'atome d'hydrogène, et en bas à gauche notre position dans la galaxie. Le reste je ne sais pas.
L'autre question est aussi de savoir pourquoi avoir choisi ces symbols comme par exemple l'atome d'hydrogène. qu'est il censé signifier dans ce message ?
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MessageSujet: Re: Décryptage des messages   Ven 28 Sep 2007 - 18:45

Perso, sans vouloir chercher aucun sens, je vois surtout des formes "artificielles"
(cercles parfaits, carrés, rectangles, diagonales, angles droits etc.)

Ce qui veut clairement dire :
déssin géométrique = on est des matheux study = on est pas si bête (quoique... Rolling Eyes)

Après, tant que ça n'coûte rien, je n'suis pas contre Wink

Mais quand c'est un projet coûteux, genre SETI, là, je dis stop non
(et pis de toute façon les E.T. c'est des méchants, dixit Hollywood Laughing)
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MessageSujet: Re: Décryptage des messages   Ven 28 Sep 2007 - 19:57

Mustard a écrit:
Personnellement j'ai toujours trouvé l'implantation d'un tel message sans fondement car si une race ET arrive à contruire des vaisseaux, croiser dans les parrages de notre système solaire, il n'aura sans aucun doute détecté notre activité et présence depuis longtemps.
Ce disque n'est pas destiné à des ET qui nous connaissent déjà, mais à des êtres qui ont à peu près notre intelligence et notre technologie.

Ce disque contient peu d'information visuelle, car c'est... un disque audio. Il y a le mode d'emploi dessiné dessus pour comment l'écouter, et on y entend des sons de la Terre, des humains etc...
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MessageSujet: Re: Décryptage des messages   Ven 28 Sep 2007 - 20:45

Mustard a écrit:
En bas à droite je crois que c'est l'atome d'hydrogène, et en bas à gauche notre position dans la galaxie. Le reste je ne sais pas.
L'autre question est aussi de savoir pourquoi avoir choisi ces symbols comme par exemple l'atome d'hydrogène. qu'est il censé signifier dans ce message ?

Euh. Si jeune ma buse :drunken:, question 11 du quizz d'Apolloman
http://www.forum-conquete-spatiale.fr/Autres-sujets-f28/QUIZ-N11-t3880.htm
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MessageSujet: Re: Décryptage des messages   Ven 28 Sep 2007 - 20:48

mic8 a écrit:
Mustard a écrit:
En bas à droite je crois que c'est l'atome d'hydrogène, et en bas à gauche notre position dans la galaxie. Le reste je ne sais pas.
L'autre question est aussi de savoir pourquoi avoir choisi ces symbols comme par exemple l'atome d'hydrogène. qu'est il censé signifier dans ce message ?

Euh. Si jeune ma buse :drunken:, question 11 du quizz d'Apolloman
http://www.forum-conquete-spatiale.fr/Autres-sujets-f28/QUIZ-N11-t3880.htm

non non mon quiz portait sur le disque des sondes Pionner tongue

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MessageSujet: Re: Décryptage des messages   Ven 28 Sep 2007 - 21:12

ou id'après le descriptif en anglais une partie est la notice pour l'utilisation du disque, mais pour être franc je n'y comprend rien. Et vous ?
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MessageSujet: Re: Décryptage des messages   Ven 28 Sep 2007 - 21:23

Apolloman a écrit:
non non mon quiz portait sur le disque des sondes Pionner tongue
Argh, juste. Rhaa.
Mais deux partie de l'iconographie du disque de Voyager sont les même que celle de la plaque de Pionner:
- la représentation de la position du soleil
- la transition hyperfine de l'atome d'hydrogène

Pour le reste effectivement, c'est plus du domaine du testament que de la découverte.
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MessageSujet: Re: Décryptage des messages   Ven 28 Sep 2007 - 21:55


This illustration on the lower right of the Voyager record cover could be considered the "Rosetta Stone" of the record, as it provides the key to interpreting the remaining cover illustrations. This illustrates the hyperfine transition of the hydrogen atom where it changes between its two lowest states. The time interval for this is a mathematical constant equal to 0.7 billionths of a second, or more precisely 7.04024183647E-10 seconds. The 1 between the two states indicates the length of the transition should be equal to a binary 1. The binary numbering system, with just two symbols, 0 and 1, is the simplest numbering system, and is more likely to be understood by other civilizations than our decimal system adopted simply because humans have 10 fingers. With hydrogen being the most abundant element in the galaxy, any advanced civilization likely to encounter the Voyager should be able to interpret the meaning of this diagram.




This is a top-down view of the Voyager record showing the stylus cartridge in place to play the disc. The position of the cartridge implies the record groove is to be played from the outside in. The symbols around the periphery of the record are a binary representation of the time required for one revolution of the record where a binary 0 is represented by a dash and a binary 1 is represented by the same vertical symbol used with the hydrogen transition above. Since leading 0's are meaningless in the binary numbering system, the number would be read off in a counter clockwise direction starting above the stylus cartridge. This also implies the record is supposed to spin clockwise relative to a stationary stylus, as that's the way the illustration needs to move to read off the binary number. The number around the periphery is 100110000110010000000000000000000 which converts to 5,113,380,864 in decimal. Multiplying this by 7.04024183647E-10 seconds yields 3.5999 seconds, the length of time for one rotation of the record.




This is a side view of the record and stylus cartridge, with two large bars enclosing a binary number indicating the length of time required to play one side of the record. Doing the math again, we have 1000010110000000000000000000000000000000000 which converts to 4,587,025,072,128 in decimal. Multiplying by 7.04024183647E-10 seconds yields 3229.377 seconds, or about 53.8 minutes to play one side.



These waveform representations of the picture signal recorded in the groove provide an explanation for how the images are to be constructed. Someone analyzing the signal on the record would be able to recognize the image portion by similar looking groups of waveforms, with each group preceded by the symmetrical waveform seen in the top left corner of this picture. Each of these groups would be further subdivided into 512 individual signals, the first three of which are shown here labeled in binary notation as 1, 10, and 11 (decimal 1, 2, and 3). Just below the waveform drawing is a conceptual drawing of what they represent, again labeled 1, 10, and 11. The conceptual drawing indicates that each of the three signals represents a "line" of the final image with each line being drawn in a staggered, non-overlapping fashion. All 512 signals taken together constitute a single image. This staggered line image is the same way television images are drawn by the electron gun inside the CRT, except in the case of modern TV the lines are arranged horizontally and interlacing is used. There is also a binary number of 101101001100000000000000 under signal 1 which converts to 11,845,632 in decimal. Multiplying this by the constant of 7.04024183647E-10 seconds yields 0.0083396 seconds. So it takes about 8 milliseconds to draw one line of an image. It might be a considerable jump for someone to look at this one portion of the record cover and interpret what the image waveforms are supposed to be, but the two images below it provide further reinforcement of the desired interpretation.




This drawing expands on the concepts presented in the waveform drawing by showing what a complete image would look like. There's a binary number 1000000000 drawn vertically above the last line of the image. This converts to 512 in decimal and indicates that the image consists of 512 lines, which would concur with the 512 similar signals within each waveform as described above. There is also a binary number of 10000 at the left end of the picture that converts to decimal 16. The interpretation of this seems somewhat cryptic, but it means that there are 16 levels of gray within each line. In other words the image quality in terms of grayscale is about equal to a photocopy of a photograph. The image quality in terms of resolution would be somewhat less than a photocopy as it equals about 500 dots along each line of the image. Thus each image has about the same number of dots along each line as there are lines in the complete image. If you think in terms of pixels rather than lines, this ratio results in square pixels.




This picture of a circle is the first image recorded on the record. It is intended for calibration purposes to ensure the signal on the disc is being decoded properly, and the right ratio of horizontal to vertical height is used in picture reconstruction. For example, if someone decoded this picture and the circle instead looked like an oval that was wider than it was tall, they would probably guess that they need to draw the picture lines closer together.




This picture has nothing to do with interpreting the disc contents, but rather is a pulsar map indicating the solar system from which the Voyager spacecraft originated. The cover of the Voyager record also contains an ultra-pure source of Uranium-238 to serve as a radioactive clock for determining the record's age. This same pulsar map as well as hydrogen atom drawing were also included on the Pioneer 10 and 11 Plaques. Each pulsar has its own distinct and rapid pulsing radio frequency that is very slowly changing with absolute linearity. It's likely that other civilizations of sufficient advancement will be familiar with these and their rates of change. The pulsar map shows fourteen pulsars and their directions from the sun along with the current frequency of the pulsar in binary notation. The horizontal line extending to the right with no binary number attached is a pointer from the sun to the center of the galaxy.

The Voyager record contains about 20 color pictures, and at first it might seem a mystery how these could be extracted from 16 levels of gray. This picture of the solar spectrum is the first color image on the record, and someone recovering the image would note that it is actually recorded on the record three times in succession, with only the gray levels being different between the three recordings. The black absorption lines extending through the rainbow pattern are distinct for any G2 star like our own sun. A civilization familiar with solar spectroscopy should be able to recognize this as the red, green, and blue portion of a solar spectrum. They should then realize that the color image can be reconstructed by making a composite of the three images, one on top of the other, with the 16 shades of gray being interpreted as 16 shades of red, green, or blue in each layer of the image. By adjusting the color values assigned to each shade of gray, they will be able to reconstitute this known image of a solar spectrum and then use those color settings to properly view the remaining color images on the record. This is the same RGB technique used with present-day computers to determine exact colors. Sixteen levels of gray corresponds to 4 bits (2 to the fourth power), so the color images on the Voyager record have a combined color depth of 12 bits which permits a total of 4096 colors (2 to the twelfth power). By comparison, a common color setting for web browsing is 16-bit or 65,536 colors, and most computers manufactured today can do 32-bit color.
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