Description:
Discussions, débats autour de l'astrophysique.
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Le modèle du Big Bang est fragile
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"Pierre Amyeu" <Pierre.Am...@invalid.fr> a écrit dans le message de ...
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Sirius est dans notre Galaxie, donc elle ne participe pas à l'expansion des galaxies, c'est logique.
-- ~~~~ clmasse on free F-country
Liberty, Equality, Profitability.
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Mars, une nouvelle Terre ?
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Et si la planète Mars devenait une nouvelle colonie humaine ? Sa proximité avec
la Terre permet toutes sortes de spéculations. Le terraformage est un concept
scientifique qui autoriserait une colonisation de la planète Rouge. Des
astrobiologistes imaginent les principales phases du processus pour la... more »
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EINSTEIN WRESTLING WITH AN UNSOLVABLE PROBLEM
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[link] John Stachel: "But here he ran into the most blatant-seeming contradiction, which I mentioned earlier when first discussing the two principles. As noted then, the Maxwell-Lorentz equations imply that there exists (at least) one inertial frame in which the speed of light is a constant regardless of the motion of the light source. Einstein's version of the relativity principle (minus the ether) requires that, if this is true for one inertial frame, it must be true for all inertial frames. But this seems to be nonsense. How can it happen that the speed of light relative to an observer cannot be increased or decreased if that observer moves towards or away from a light beam? Einstein states that he wrestled with this problem over a lengthy period of time, to the point of despair."... more »
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THE SHORTEST REFUTATION OF EINSTEIN'S RELATIVITY
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The observer starts moving towards the light source with speed v so the frequency he measures shifts from f to f' and the speed of light he measures shifts from c to c'. f'=? c'=? [link]
Roger Barlow, Professor of Particle Physics: "Moving Observer. Now suppose the source is fixed but the observer is moving towards the source, with speed v. In time t, ct/(lambda) waves pass a fixed point. A moving point adds another vt/(lambda). So f'=(c+v)/(lambda)."... more »
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Le moteur magnétique à aimants !
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Attention c'est nouveau est ça vient de sortir (ou presque...) et ça va faire trembler le cartel du pétrole et tutti quanti.
[link]
Le moteur magnétique
Épisode 2 - 21/05/2012
Et si Aurélien avait trouvé la solution alternative au moteur thermique... more »
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AMUSING USES OF EINSTEIN'S ABSURDITIES
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[link] Parabola Volume 35, Issue 1 (1999), LENGTH AND RELATIVITY, John Steele: "In a previous issue issue of Parabola (Vol 29 No 2 p.2), I discussed the effect on time measurement of Einstein's two postulates of Special Relativity. These two postulates are: 1. the laws of Physics are the same to any inertial observer and 2. there is an inertial observer for whom light signals in vacuum travel at a constant speed in all directions whatever the motion of the light source. (...) The Pole in the Barn Paradox. Now we know about length contraction, we can invent some amusing uses of it. Suppose you want to fit a 20m pole into a 10m barn. If the pole were moving fast enough, then length contraction means it would be short enough. (...) Hence in both frames of reference, the pole fits inside the barn (and will presumably shatter when the doors are closed)."... more »
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3eme loi de la Thermodynamique
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Je cite un astrophysicien :
"Un Américain avait, il y a deux décennies émis une conjecture, au vu du nombre croissant des publications scientifiques, sous la forme d'une troisième loi de la thermodynamique : Quand l'univers aura achevé son évolution, il ne sera plus constitué que de papier".... more »
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