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Solar system formation. Momentum distribution?
At work, a friend asked me how I thought the solar system was formed. I
asked him if he had ever heard of the accretion disc theory. He said yes. He added that he thought the theory was badly flawed because the theory predicts that the momentum and mass will be in the same place when a system develops. Not, as it is with our system where the majority of the mass is in the Sun while the majority of the momentum is in the planets. It seems to me that he does have a point. Where have I gone wrong here? Errol |
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Solar system formation. Momentum distribution?
Starboard wrote: He added that he thought the theory was badly flawed because the theory predicts that the momentum and mass will be in the same place when a system develops. Correction. Not that the theory was flawed, but that the theory could not accurately explain our system because of the stated momentum problem. Errol |
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Solar system formation. Momentum distribution?
"Sam Wormley" wrote in message newsjkmh.199617$aJ.165447@attbi_s21... Starboard wrote: At work, a friend asked me how I thought the solar system was formed. I asked him if he had ever heard of the accretion disc theory. He said yes. He added that he thought the theory was badly flawed because the theory predicts that the momentum and mass will be in the same place when a system develops. Not, as it is with our system where the majority of the mass is in the Sun while the majority of the momentum is in the planets. It seems to me that he does have a point. Where have I gone wrong here? Recent material captured from Comet Wild 2 and observational evidence from the stellar nurseries in M42 indicate that star formation (and implied planetary formation) is likely much more violent than previously thought. "The Stardust spacecraft collected thousands of particles from comet 81P/Wild 2 and returned them to Earth for laboratory study. The preliminary examination of these samples shows that the nonvolatile portion of the comet is an unequilibrated assortment of materials that have both presolar and solar system origin. The comet contains an abundance of silicate grains that are much larger than predictions of interstellar grain models, and many of these are high-temperature minerals that appear to have formed in the inner regions of the solar nebula. Their presence in a comet proves that the formation of the solar system included mixing on the grandest scales". The dominant principles involved in solar system formation include o gravitational collapse o conservation of angular momentum o protostar magnetic fields, jets and solar wind We have a lot to learn, but the idea that planet and other bodies accreted from the planetary nebulae is well supported by the cratering records on all colid bodies and the chemical analysis of bodies at various zones in our planetary system. Why yes oh wise one. |
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Solar system formation. Momentum distribution?
Starboard wrote:
At work, a friend asked me how I thought the solar system was formed. I asked him if he had ever heard of the accretion disc theory. He said yes. He added that he thought the theory was badly flawed because the theory predicts that the momentum and mass will be in the same place when a system develops. Not, as it is with our system where the majority of the mass is in the Sun while the majority of the momentum is in the planets. This is a known issue. At the present time, it is believed to be resolved: The angular momentum of the proto-Sun was transferred to the planets over time through magnetic field interactions. That is, the Sun's magnetic field accelerated particles out in the planetary system, and its own rotation slowed as a result (Newton's third law). I don't know the details, but you can probably find them by searching for "solar system" and "angular momentum." -- Brian Tung The Astronomy Corner at http://astro.isi.edu/ Unofficial C5+ Home Page at http://astro.isi.edu/c5plus/ The PleiadAtlas Home Page at http://astro.isi.edu/pleiadatlas/ My Own Personal FAQ (SAA) at http://astro.isi.edu/reference/faq.html |
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