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Timeline of a nuclear explosion in pictures

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Timeline of a nuclear explosion in pictures

Pictures from several detonations as examples of an atomic explosions anatomy

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Photographers and reporters gather near Frenchman Flat to observe the Priscilla nuclear test; June 24, 1957

Nuclear Chemistry Behind the Explosion

Atomic bombs are made up of a fissile element, such as uranium, that is enriched in the isotope that can sustain a fission nuclear chain reaction. When a free neutron hits the nucleus of a fissile atom like uranium-235 (235U), the uranium splits into two smaller atoms called fission fragments, plus more neutrons. Fission can be self-sustaining because it produces more neutrons with the speed required to cause new fissions. This creates the chain reaction.

The uranium-235 content of "weapons-grade" uranium is generally greater than 85 percent, though inefficient weapons, deemed "weapons-usable," can be made of 20 percent enriched uranium. The very first uranium bomb, Little Boy, dropped on Hiroshima in 1945, used 64 kilograms of 80 percent enriched uranium.

In fission weapons, a mass of fissile material, either enriched uranium or plutonium, is assembled into a supercritical mass—the amount of material needed to start an exponentially growing nuclear chain reaction. This is accomplished either by shooting one piece of sub-critical material into another, termed the "gun" method, or by compressing a sub-critical sphere of material using chemical explosives to many times its original density, called the "implosion" method.

The implosion method is considered more sophisticated than the gun method and only can be used if the fissile material is plutonium. The inherent radioactivity of uranium will then release a neutron, which will bombard another atom of 235U to produce the unstable uranium-236, which undergoes fission, releases further neutrons, and continues the process.The uranium atom can split any one of dozens of different ways, as long as the atomic weights add up to 236 (uranium plus the extra neutron). The following equation shows one possible split, namely into strontium-95 (95Sr), xenon-139 (139Xe), and two neutrons (n), plus energy:

The immediate energy release per atom is about 180 million electron volts (Me). Of the energy produced, 93 percent is the kinetic energy of the charged fission fragments flying away from each other, mutually repelled by the positive charge of their protons. This initial kinetic energy imparts an initial speed of about 12,000 kilometers per second.

However, the charged fragments' high electric charge causes many inelastic collisions with nearby nuclei, and thus these fragments remain trapped inside the bomb's uranium pit. Here, their motion is converted into X-ray heat, a process which takes about a millionth of a second. By this time, the material in the core and tamper of the bomb is several meters in diameter and has been converted to plasma at a temperature of tens of millions of degrees. This X-ray energy produces the blast and fire which are normally the purpose of a nuclear explosion.

Source: Boundless. “The Atomic Bomb.” Boundless Chemistry. Boundless, 08 Aug. 2016. Retrieved 10 Nov. 2016 from The Atomic Bomb - Boundless Open Textbook

Detonation: The Actual Time of the Reaction

Neutron travels at speeds of about 10 million meters per second, or about 3% the speed of light. The characteristic time for a generation is roughly the time required to cross the diameter of the sphere of fissionable material.

A critical mass of uranium is about the size of a softball (0.1 meters).

The time the neutron would take to cross the sphere is:

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OR

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The complete process of a bomb explosion is about 80 times this number, or slightly less than a microsecond or .0000008 seconds.

The 80 times represents how many fissions generations occurred in the Trinity test bomb but 99.99% of the energy is released in the last 10 generations, in total .00000008 seconds. This time was informally known as a 'shake' ("as fast as the shake of a lamb's tail") by the physicists at Los Alamos.

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.00000008 seconds

Immediately after the explosion time, the temperature of the weapon material is several tens of million degrees and the pressures are estimated to be many million atmospheres. As a result of numerous inelastic collisions, part of the kinetic energy of the fission fragments is converted into internal and radiation energy. Some of the electrons are removed entirely from the atoms, thus causing ionization, others are raised to higher energy (or excited) states while still remaining attached to the nuclei. Within an extremely short time, perhaps a hundredth of a microsecond or so, the weapon residues consist essentially of completely and partially stripped (ionized) atoms, many of the latter being in excited states, together with the corresponding free electrons. The system then immediately emits electromagnetic (thermal) radiation, the nature of which is determined by the temperature. Since this is of the order of several times 107 degrees, most of the energy emitted within a microsecond or so is in the soft X-ray region

 
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H (maximum for local fallout)

where H feet is the maximum value of the height of burst for which there will be appreciable local fallout. This expression is plotted above. For an explosion of 1,000 kilotons, i.e., 1 megaton yield, it can be found from the above graph that significant local fallout is probable for heights of burst less than about 2,900 feet. It should be emphasized that the heights of burst estimated in this manner are approximations only, with probable errors of +30 percent. Furthermore, it must not be assumed that if the burst height exceeds the value in the graph there will definitely be no local fallout. The amount, if any, maybe expected, however, to be small enough to be tolerable under emergency conditions.

H (maximum for local fallout)

where H feet is the maximum value of the height of burst for which there will be appreciable local fallout. This expression is plotted above. For an explosion of 1,000 kilotons, i.e., 1 megaton yield, it can be found from the above graph that significant local fallout is probable for heights of burst less than about 2,900 feet. It should be emphasized that the heights of burst estimated in this manner are approximations only, with probable errors of +30 percent. Furthermore, it must not be assumed that if the burst height exceeds the value in the graph there will definitely be no local fallout. The amount, if any, maybe expected, however, to be small enough to be tolerable under emergency conditions.

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.001 seconds

It is apparent that the kinetic energy of the fission fragments, constituting some 85 percent of the total energy released, will distribute itself between thermal radiation, on the one hand, and shock and blast, on the other hand, in proportions determined largely by the nature of the ambient medium. The higher the density of the latter, the greater the extent of the coupling between it and the energy from the exploding nuclear weapon. Consequently, when a burst takes place in a medium of high density, e.g., water or earth, a larger percentage of the kinetic energy of the fission fragments is converted into shock and blast energy than is the case in a less dense medium, e.g., air. At very high altitudes, on the other hand, where the air pressure is extremely low, there is no true fireball and the kinetic energy of the fission fragments is dissipated over a very large volume. In any event, the form and amount in which the thermal radiation is received at a distance from the explosion will depend on the nature of the intervening medium.

At very early times, beginning in less than a microsecond, an "inner" shock wave forms driven by the expanding bomb debris. This shock expands outward within the isothermal sphere at a velocity exceeding the local acoustic velocity. The inner shock overtakes and merges with the outer shock at the fireball front shortly after hydrodynamic separation. The relative importance of the debris shock wave depends on the ratio of the yield to the mass of the exploding device and on the altitude of the explosion

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.001 seconds

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.001 seconds

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Explosion at .001 seconds. The support tower in the image above provides a convenient size scale. Most of the above images capture the fireball when it is 100 feet in diameter.

At this stage of the detonation the surface of the fireball has a temperature of 20,000 degrees, three times hotter than the sun's surface. The spikes in the above images are a result from the guide wires supporting the tower on which the bomb was located absorbing enough heat to turn into light emitting plasma. Because thermal radiation travels faster than the fireball, the spikes extend out ahead of it.

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a few milliseconds old you can see the shockwave hitting the desert floor in front of the fireball and bouncing back. Various trucks and tanks are scattered on the desert floor for the test

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Just touching the ground

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.010 seconds The uneven surface of these explosions has been attributed to variations in the bomb construction, thickness and materials as they are vaporized and turn into this expanding shell of plasma, fire and various gasses.

A primary form of energy from a nuclear explosion is thermal radiation. Initially, most of this energy goes into heating the bomb materials and the air in the vicinity of the blast. Temperatures of a nuclear explosion reach those in the interior of the sun, about 100,000,000° Celsius, and produce a brilliant fireball.

Two pulses of thermal radiation emerge from the fireball. The first pulse, which lasts about a tenth of a second, consists of radiation in the ultraviolet region. The second pulse which may last for several seconds, carries about 99 percent of the total thermal radiation energy. It is this radiation that is the main cause of skin burns and eye injuries suffered by exposed individuals and causes combustible materials to break into flames.

For some time the fireball continues to grow in size at a rate determined by the propagation of the shock front in the surrounding air. During this period the temperature of the shocked air decreases steadily so that it becomes less opaque. Eventually, it is transparent enough to permit the much hotter and still incandescent interior of the fireball, i.e., the isothermal sphere, to be seen through the faintly visible shock front. The onset of this condition at about 15 milliseconds (0.015 second) after the detonation of a 20-kiloton weapon, for example, is referred to as the "breakaway."

Following the breakaway, the visible fireball continues to increase in size at a slower rate than before, the maximum dimensions being attained after about a second.

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.016 seconds

The Trinity explosion, 16 ms after detonation. The viewed hemisphere’s highest point in this image is about 200 metres (660 ft) high.

As the fireball cools, the transfer of energy by radiation and radiative growth become less rapid because of the decreasing mean free path of the photons. When the average temperature of the isothermal sphere has dropped to about 300,000°C, the expansion velocity will have decreased to a value comparable to the local acoustic (sound) velocity. At this point, a shock wave develops at the fireball front and the subsequent growth of the fireball is dominated by the shock and associated hydrodynamic expansion. The phenomenon of shock formation is sometimes called "hydrodynamic separation." For a 20-kiloton burst it occurs at about a tenth of a millisecond after the explosion when the fireball radius is roughly 40 feet

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at .o25 seconds … having expanded to a 1000 ft in diameter the double shock wave is apparent on the expanding edges

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Trinity test ground zero after blast.

The original test report from Los Alamos Trinity test http://permalink.lanl.gov/object...

 

 

Hydrogen bomb sequence coming.

Redwing H-Bomb detonation on a barge at Bikini atoll in Operation Redwing in 1956.

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A Question of Scale

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Castle Bravo Sequence

On March 1, 1954, it was the highest yield test in the United States’ highest-yield nuclear test series, exploding with a force of 15 million tons of TNT.

http://www.dtra.mil/Portals/61/D...
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Castle BRAVO, 3.5 seconds after detonation, photo taken from a distance of 75 nautical miles from ground zero, from an altitude of 12,500 feet.

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Castle BRAVO, 62 seconds after detonation. “This image was take at a distance of 50 [nautical miles] north GZ from an altitude of 10,000 feet. The lines running upward to the left of the stem and below the fireball are smoke trails from small rockets. At this time the cloud stem was about 4 mi in diameter.”

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Castle BRAVO, 16 minutes after detonation, seen from a distance of 50 nautical miles, at an altitude of 10,000 feet.

This is a work in progress … I will be adding to it

Trinity science details taken from Scientific Aspects of Nuclear Explosion Phenomena

For a current assessment of the threat of nuclear destruction go here Allen E Hall's answer to How destructive is the World's nuclear arsenal?

 

Allen E. Hall

 

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    • folens  »  Eric Ouellet

      Bonjour Eric, merci pour cet exposé sur Hanna, Bonne journée. Michel
      ENTRETIEN AVEC DIEU.pptx
      · 1 reply
    • Eric Ouellet

      LA FOI D'HANNA ENVERS DIEU APPORTE SA RÉCOMPENSE
      UNE femme de foi adresse une prière à Jéhovah. Convaincue que c’est Dieu qui l’a relevée de la poussière, transformant son abattement en exultation, elle le loue à haute voix.
      Cette femme, c’est Hanna. Qu’est-ce qui explique son spectaculaire changement d’état d’âme ? Pourquoi est-elle à présent si joyeuse ? En quoi ce qu’elle a vécu peut-il nous être utile ? Intéressons-nous à son histoire.
      Une famille sous pression
      Hanna est l’une des deux femmes d’Elqana, un Lévite de la région d’Éphraïm (1 Samuel 1:1, 2a ; 1 Chroniques 6:33, 34). Bien que n’entrant pas dans le dessein originel de Dieu pour l’humanité, la polygamie est autorisée et réglementée sous la Loi mosaïque. Elle est néanmoins une source fréquente de discorde. La vie de cette famille, qui pourtant adore Jéhovah, en témoigne.
      Hanna est stérile, tandis que Peninna, l’autre femme d’Elqana, a plusieurs enfants. Peninna se comporte en rivale. — 1 Samuel 1:2b.
      Pour une Israélite, la stérilité est un déshonneur, et même un signe de la défaveur divine. Mais, dans le cas de Hanna, rien n’indique que son incapacité de procréer soit liée à la désapprobation de Dieu. Peninna ne la console pas pour autant ; elle se prévaut au contraire de son statut de mère pour l’humilier.
      Au sanctuaire de Jéhovah
      Malgré ces tensions, la famille entreprend le voyage annuel en direction du sanctuaire de Jéhovah, à Shilo, pour y offrir des sacrifices. L’aller-retour de quelque 60 kilomètres se fait vraisemblablement à pied. Cet événement doit être particulièrement pénible pour Hanna. En effet, Peninna et ses enfants reçoivent plusieurs portions du sacrifice de communion, alors que Hanna, elle, n’en reçoit qu’une seule. Peninna trouve là une opportunité supplémentaire de la blesser et de la mettre dans l’embarras ; il semble que Jéhovah ait “ fermé sa matrice ”, et elle ne manque pas de le lui rappeler. Tous les ans, c’est le même calvaire. Tous les ans, Hanna pleure et cesse de manger. Ces voyages qui normalement devraient la mettre en joie la plongent dans une profonde détresse. Hanna se rend néanmoins chaque année au sanctuaire de Jéhovah. — 1 Samuel 1:3-7.
      Voyez-vous en quoi Hanna est un bel exemple ? Comment réagissez-vous lorsque vous êtes déprimé ? Vous isolez-vous et évitez-vous les contacts avec vos compagnons chrétiens ? Ce n’est pas ce qu’a fait Hanna. Les rassemblements avec les adorateurs de Jéhovah étaient pour elle une habitude de vie. Même face à des circonstances éprouvantes, il devrait en être de même pour nous. — Psaume 26:12 ; 122:1 ; Proverbes 18:1 ; Hébreux 10:24, 25.
      Elqana tente de réconforter Hanna et il l’amène à exprimer ses sentiments profonds. “ Hanna, pourquoi pleures-tu et pourquoi ne manges-tu pas ? Pourquoi ton cœur a-t-il mal ? lui demande-t-il. Est-ce que je ne vaux pas mieux pour toi que dix fils ? ” (1 Samuel 1:8). Peut-être n’a-t-il pas conscience de la malveillance de Peninna. Et peut-être Hanna préfère-t-elle se taire plutôt que de se plaindre. Quoi qu’il en soit, cette femme spirituelle se tourne vers Jéhovah dans la prière pour retrouver la paix intérieure.
      Le vœu de Hanna
      Les sacrifices de communion étaient consommés dans le sanctuaire. Après avoir quitté la salle à manger, Hanna prie Dieu (1 Samuel 1:9, 10). “ Ô Jéhovah des armées, implore-t-elle, si tu ne manques pas de regarder l’affliction de ton esclave et si vraiment tu te souviens de moi, si tu n’oublies pas ton esclave et si vraiment tu donnes à ton esclave un descendant mâle, oui je le donnerai à Jéhovah pour tous les jours de sa vie, et le rasoir ne viendra pas sur sa tête. ” — 1 Samuel 1:11.
      La prière de Hanna est précise. Elle demande un fils, et elle fait le vœu que cet enfant sera toute sa vie un naziréen de Dieu (Nombres 6:1-5). Ce vœu nécessite l’approbation de son mari, et certaines actions ultérieures d’Elqana montrent qu’il approuve l’engagement pris par sa chère femme. — Nombres 30:6-8.
      À cause de la manière dont Hanna prie, le grand prêtre Éli la croit ivre. Il voit effectivement ses lèvres frémir, mais il ne l’entend pas parler. C’est qu’en fait Hanna prie dans son cœur, avec ferveur (1 Samuel 1:12-14). Imaginez ce qu’elle ressent lorsque le grand prêtre l’accuse d’être ivre ! Pourtant, elle lui répond respectueusement. Comprenant alors que Hanna était en train de prier “ dans l’abondance de [son] inquiétude et de [son] dépit ”, il lui dit : “ Que le Dieu d’Israël accorde ta requête. ” (1 Samuel 1:15-17). Sur ces paroles, Hanna s’en va ; elle mange et “ son visage ne par[aît] plus soucieux ”. — 1 Samuel 1:18.
      Que nous enseigne tout cela ? Lorsque nous prions Jéhovah à propos de nos inquiétudes, nous pouvons lui exprimer ce que nous ressentons et lui adresser des requêtes sincères. Si nous avons fait tout notre possible pour résoudre le problème, alors nous devrions laisser les choses entre ses mains. C’est ce qu’il y a de mieux à faire. — Proverbes 3:5, 6.
      Après une prière fervente, il est fréquent que des serviteurs de Jéhovah ressentent une sérénité comparable à celle que Hanna a éprouvée. Voici ce qu’a écrit l’apôtre Paul au sujet de la prière : “ Ne vous inquiétez de rien, mais en tout, par la prière et la supplication avec action de grâces, faites connaître vos requêtes à Dieu ; et la paix de Dieu, qui surpasse toute pensée, gardera vos cœurs et vos facultés mentales par le moyen de Christ Jésus. ” (Philippiens 4:6, 7). Après nous être déchargés de notre fardeau sur Jéhovah, nous devons le laisser s’en occuper. Puis, comme dans le cas de Hanna, il n’y a plus lieu de s’inquiéter. — Psaume 55:22.
      Un fils “ prêté ” à Jéhovah
      Dieu se tourne alors vers Hanna. Peu après, elle porte un enfant. Elle met au monde un garçon (1 Samuel 1:19, 20). C’est l’une des rares fois où la Bible fait état de la responsabilité de Dieu dans la naissance de l’un de ses serviteurs. L’enfant d’Elqana et de Hanna, Samuel, deviendra effectivement le prophète de Jéhovah, un prophète qui jouera un rôle important dans la mise en place de la monarchie d’Israël.
      Il est certain que Hanna parle de Jéhovah à Samuel dès sa petite enfance. Mais oublie-t-elle le vœu qu’elle a fait ? Absolument pas ! “ Dès que le garçon sera sevré, je devrai l’amener ; il devra paraître devant Jéhovah et habiter là pour des temps indéfinis ”, déclare-t-elle. Et en effet, une fois l’enfant sevré — peut-être à l’âge de trois ans ou un peu plus —, elle l’amène au sanctuaire, comme elle l’avait promis. — 1 Samuel 1:21-24 ; 2 Chroniques 31:16.
      Après avoir offert un sacrifice à Jéhovah, Hanna et son mari présentent Samuel à Éli. Hanna tient certainement la main de son petit garçon lorsqu’elle dit à Éli : “ Pardon, mon seigneur ! Par la vie de ton âme, mon seigneur, je suis la femme qui se tenait près de toi, en ce lieu, pour prier Jéhovah. C’est à propos de ce garçon que je priais, pour que Jéhovah m’accorde ma requête, ce que je lui demandais. Et moi, à mon tour, je l’ai prêté à Jéhovah. Oui, tous les jours qu’il sera, c’est quelqu’un de demandé pour Jéhovah. ” Ainsi commence, pour Samuel, une vie au service de Dieu. — 1 Samuel 1:25-28 ; 2:11.
      Le temps passe ; bien sûr Hanna n’oublie pas son fils. Les Écritures relatent : “ Sa mère avait coutume de lui faire un petit manteau sans manches, et elle le lui montait, d’année en année, quand elle montait avec son mari pour sacrifier le sacrifice annuel. ” (1 Samuel 2:19). Hanna prie sans aucun doute pour Samuel. Tous les ans, lorsqu’elle lui rend visite, elle l’encourage à coup sûr à demeurer fidèle dans son service pour Dieu.
      Pendant l’une de ces visites, Éli bénit les parents du garçon. Il déclare à Elqana : “ Que Jéhovah t’assigne une descendance de cette femme, à la place du prêt qui a été prêté à Jéhovah. ” C’est ainsi que le couple est récompensé par la naissance de trois autres fils et de deux filles. — 1 Samuel 2:20, 21.
      Quel formidable exemple pour les parents chrétiens ! Beaucoup de mères et de pères se montrent, eux aussi, disposés à prêter, figurément parlant, leurs enfants à Jéhovah ; en effet, ils les encouragent à entreprendre une forme de service à plein temps, même si cela implique que leur fils, ou leur fille, vive loin d’eux. De tels parents aimants méritent des louanges pour les sacrifices qu’ils font. Jéhovah les récompensera.
      Une prière qui déborde de joie
      Comme Hanna est heureuse, elle que la stérilité affectait tant autrefois ! Les Écritures ne contiennent que peu de prières faites par des femmes. Mais, en ce qui concerne Hanna, elles en rapportent deux. La première expose ses sentiments alors qu’elle est humiliée et affligée. La seconde exprime son exultation et son action de grâces ; elle commence par ces mots : “ Oui, mon cœur exulte en Jéhovah. ” Hanna se réjouit ensuite que ‘ même la stérile ait mis au monde ’. Et elle loue Jéhovah, celui “ qui élève [...], qui relève le petit de la poussière ”. Vraiment, il est celui qui “ de la fosse aux cendres [...] fait remonter le pauvre ”. — 1 Samuel 2:1-10.
      Cet épisode de la vie de Hanna, dont le récit a été inspiré par Dieu, montre que les imperfections, voire la malveillance, des autres peuvent nous blesser. Toutefois, nous ne devons pas permettre à ce genre d’épreuves de nous priver de notre joie de servir Dieu. Jéhovah est, par excellence, Celui qui entend la prière, qui répond aux appels à l’aide de ses fidèles et qui les délivre de l’affliction. Il leur accorde une paix profonde et de nombreuses autres bénédictions. — Psaume 22:23-26 ; 34:6-8 ; 65:2.

      · 0 replies
    • Eric Ouellet

      1 Samuel 2 : 1-10
      Hannah pria Dieu en ces mots:
      Mon cœur se réjouit au sujet de Jéhovah
      ma force grandit grâce à Jéhovah.
      Ma bouche s’ouvre toute grande contre mes ennemis,
      car je me réjouis de tes actes sauveurs.
      Il n’y a personne qui soit saint comme Jéhovah,
      il n’y a personne qui soit comme toi,
      il n’y a pas de rocher comme notre Dieu.
      Arrêtez de parler avec orgueil ;
      que rien d’arrogant ne sorte de votre bouche,
      car Jéhovah est un Dieu qui sait tout
      et il juge les actions avec justice.
      Les arcs des hommes forts sont brisés,
      mais les hommes faibles reçoivent de la force
      Ceux qui mangeaient bien doivent trouver du travail pour avoir du pain,
      mais les affamés ne souffrent plus de la faim.
      La femme stérile a donné naissance à sept fils,
      mais celle qui avait beaucoup de fils est devenue stérile.
      Jéhovah tue et il garde en vie,
      il fait descendre dans la Tombe et il en fait remonter.
      Jéhovah fait devenir pauvre et il fait devenir riche,
      il abaisse et il élève.
      Il relève le petit de la poussière
      et fait remonter le pauvre du tas de cendres
      pour les faire asseoir avec les princes
      et leur offrir une place d’honneur.
      À Jéhovah appartiennent les fondations de la terre ;
      sur elles, il pose le monde
      Il veille sur les pas de ses fidèles,
      mais les méchants seront tués dans l’obscurité,
      car ce n’est pas par la force que l’homme triomphe. 
      Jéhovah anéantira ceux qui combattent contre lui ;
      pour exprimer sa colère, il fera gronder le tonnerre dans le ciel.
      Jéhovah jugera jusqu’aux extrémités de la terre,
      il donnera du pouvoir à son roi et il fera grandir la force de son oint.
       
       
       


      · 1 reply
    • anniemsbelle@gmail.com  »  Queen Esther

      Do you have the print out for the regional convention 
      · 1 reply
    • anniemsbelle@gmail.com  »  Queen Esther

      Do you have the print out for the regional convention 
      · 0 replies
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