Black People : The Invisible Universe

Amnat77

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June 29 - July 3, 2009

The essential is invisible to our eye., astronomy and astrophysics and more in particular modern cosmology have shown that most of the universe is invisible to our eyes and to the most advanced observational devices.

observatoire de meudonWith the formulation of the theory of general relativity by Albert Einstein, the universe in the 20th century has become a physical object like many others, and cosmology has finally become a truly scientific discipline. Nonetheless a puzzling picture of the universe has arisen. It is invisible for more than 95%. In fact a consistent analysis of the observations of the farthest and most obscure regions of the universe, when interpreted in the light of modern physical theories suggests that 25% of the total energy budget of the universe is in a form of a mysterious matter component, dubbed dark matter, and 70% is in a even more exotic form, dubbed dark energy. Suddenly, cosmology becomes a precious and unique experimental laboratory where fundamental theories of physics can be tested, from general relativity to the physics of elementary particles in energy ranges inaccessible to our Earth laboratories.

Among the several questions to which this science has to find an answer, one of the most important concerns the energetic content of the Universe. The exact knowledge of what the Universe is made of and in which amounts, would allow not only to determine its age, its past and future evolution, but also to address from a scientific point of view the question about its finiteness or its final end. The is because the evolutionary history of a universe for a given geometry admits only a particularly fixed energetic content. It is this equivalence between the energetic content and the space-time properties of the Universe that lead cosmologists to make some of the most mysterious and promising discoveries in the history of modern science: the existence of dark matter and dark energy.


http://www.univers2009.obspm.fr/pages/recherche/
 

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