LA CENTRALE

Le Soleil, la source d'énergie centrale de notre système solaire. Une étoile jaune de taille moyenne, composée principalement d'hydrogène - l'élément chimique le plus léger de l'univers. Par un processus de fusion nucléaire - l'union des atomes - le Soleil forme des atomes plus denses, libérant de l'énergie et de la chaleur pendant le processus. Cette énergie et cette chaleur rayonnent vers l'extérieur, dans toutes les directions, à travers le vide spatial. Toutes les planètes de notre système solaire interceptent une petite quantité de cette énergie et de cette chaleur alors qu'elles tournent autour de leur axe et gravitent autour du Soleil. L'énergie se déplace à la limite de vitesse universelle - connue sous le nom de vitesse de la lumière (c) : qui est d'environ 3 x 108 mètres par seconde. La Terre se trouve à un peu moins de 150 millions de kilomètres du Soleil, de sorte qu'il faut 8,3 minutes pour que l'énergie qui sort de la surface du Soleil atteigne l'atmosphère terrestre.

ARTICLES COURTS SUR LE SOLEIL

Pour en savoir plus sur la façon dont l'énergie, la lumière et la chaleur sont générées dans le Soleil, et sur ce qu'est réellement la lumière, l'énergie et la chaleur qui en résultent, alors plongez dans les billets de blog ci-dessous. L'ordre chronologique a aussi un sens dans l'ordre de compréhension : commencer par des concepts plus simples au début (au bas de la page), et devenir plus complexe au fur et à mesure que le temps passe (près du haut).

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    Electromagnetic Energy is not only the primary source (or secondary source after gravity…) of energy on Earth, ‘light,’ the smaller fraction of the electromagnetic spectrum, is also an important source of information for many forms of organisms. The different properties of light, such as intensity, duration, polarisation, and spectral composition, can all be used as sources of information. “In all, light sensing is connected to movement in some way so that, once signalled, the creature
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    EM Spectrum The Sun emits electromagnetic radiation in many different wave lengths. The actual EM radiated by the Sun, is known as the solar spectrum, and is made up of some ultraviolet (A, B, and C), but mostly ‘visible light’, and infrared (A, B, and C) - as heat. It extends from around 290 nm to more than 3200 nm. Some stronger rays are emitted by the Sun (such as X-Rays), as mentioned in previous
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    Waves There are two main types of waves, mechanical waves and electromagnetic waves: and these are the main ways that energy moves from point A to point B: in other words, all waves transport energy as they travel. Mechanical waves need a medium for energy to be transferred through - they can not travel through a vacuum. Mechanical waves, include ocean waves, seismic waves, or sound waves for instance - i.e., sound needs water or
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    The energy and heat that reaches the Earth ultimately comes from the Sun, with vastly smaller amounts from other astrophysical sources (i.e., Pulsars and Quasars, and radio waves emanating from Jupiter). The energy and heat released from the Sun comes in the form of electromagnetic (or EM) radiation, propagating outwards in all directions, and from the more sporadic solar winds. An Overview Electromagnetic (EM) energy, is a form of radiation, as it travels out as
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    This section goes into more detail on some of the main zones (differentiated by the main form of energy transfer taking place), between the core and the Sun's outer surface; describing the main reactions, occurring as energy slowly travels outwards, before finally being released into outer-space. The Radiation Zone Within the Radiation Zone, the Positrons quickly encounter high attraction collisions with the many free electrons (it’s antiparticle with a negative charge), annihilating both, and giving off two or more
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    “The nitrogen in our DNA, the calcium in our teeth, the iron in our blood, the carbon in our apple pies were made in the interiors of collapsing stars. We are made of star stuff.” Carl Sagan During the Big Bang, it is theorised that temperatures were so high that fusion reactions took place, and made the very lightest elements - the base elements for all other elements - in the universe (hydrogen, two different
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    The scale of energy released through a fusion reaction (measured in millions of electron-volts - MeV) is around a million times greater than that of the energy released through the breaking of chemical bonds - the bonds between atoms (measured in eV), which is the source of energy for all non-photosynthetic heterotrophic life on Earth - such as Animals and Mushrooms, and that, which is in contained in fossil fuels. Fusion energy, does not (currently)
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    Image Above: Barnard 68, a molecular (black) cloud of gas and dust, which will become a star, perhaps in the next 100,000 years. At the moment, it is still very cold (around 4 Kelvin), and so the particles are moving around very slowly, and gravity has not yet began to dominate. Once gravity dominates, the star will begin to collapse (known at this stage as a protostar), and eventually the core will be hot enough,
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    Overview of Forces in Atoms An atom is a basic unit of matter, comprising of a dense, very small, nucleus at it's centre, surrounded at a relatively huge distance, by negatively charged electron(s) in orbit (the orbit is described as the electron shell or cloud), which are attracted by the electromagnetic force to the nucleus - mediated by protons. The Nucleus consists of electrically neutral neutrons, and positively charged protons (except hydrogen 1H, which doesn't have a neutron), which are bound together by the Strong Nuclear Force - mediated by