Originally posted by JaxonRoberts
reply to post by Essan

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Apparently, astronomy is not your strong suit. The orbital plane of the Earth is not in alignment with the orbital plane of the galaxy. The Sun is only between us and the Galactic Core, which is a super massive Black Hole, once every 26,000 years. Twice a year? Please! You are confusing our crossing of the Galactic Plane with a alignment with the Galactic Core, which are two totally separate events. Crossing the Galactic Plane has no gravitational effects. A Galactic Core alignment however, very well could. Why does the completion of the wobble of Earth's axis and this alignment coincide? Both occur every 26,000 years. I don't know, but it has to be something.

[edit on 19-9-2008 by JaxonRoberts]

Originally posted by Phage
reply to post by JaxonRoberts

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That video is blabbering about the vertical oscillation of the Solar System relative to the galactic plane. This cycle does exist but its period is many millions of years, not 26,000. The Maya had no way of knowing about this cycle. We are in the galactic plane right now. The Galaxy is some 3,000 light years thick (in our neighborhood) and you want to believe that the Mayan calendar, much less modern science can predict the year when we will be smack in the middle of it?

The recent findings of nearly matching long-term cyclicity in biological mass extinctions, geomagnetic reversals, impact cratering and other terrestrial processes have evoked a major controversy. We report here a compilation and analysis of major global magmatic episodes showing a significant enhancement of volcanic activity with a periodicity of 33 million years for the last 250 million years. These magmatic episodes match extremely well the best available astronomical estimates of the periodic (31 ± 5 Myr) galactic-disc crossing events during vertical motions of the solar system. These events also have a close linkage with the marine biological mass extinctions and other geological rhythms. It is argued that the prolonged volcanic activity, instead of impact cratering, may have been the more immediate primary cause for profound climatic and other environmental deterioration sufficient to create biological crises on a global scale. The volcanic periodicity scheme is well supported by the evidence of recent increases in volcanic activity.

The black hole at the center of The Galaxy is far too far away to have any affect on the Solar System or the Earth. The notion that gravity is stronger in the accretion disc is just wrong.
[edit on 19-9-2008 by Phage]

The structure and the dynamics of the accretion disc remain quite mysterious. The disc is not directly observable because the resolution of current telescopes is still insufficient. It is primarily studied at short wavelengths (UV, X and gamma rays). But short wavelength spectra give information only on the internal regions of the disc (scale of the micro-parsec), very close to the black hole. The external parts of the disc (the milliparsec-scale) are made up of colder gas and radiate in the visible, infra-red, and mm bands. One suspects that at these distances, the mass of the disc (generally regarded as small) starts to play a role on its own dynamics, and thus on its evolution and its structure. At the parsec scale for example, models indicate that the mass of the disc could reach (even exceed) that of the black hole. One then expects very particular effects, like a non-keplerian rotation, and the generation of gravitational instabilities (spiral waves, etc.) who could lead to the formation of compact objects in the disc itself (like stars or planets) (Collin & Zahn, 1999, A & A, 344, 433). A point is that, the accretion disc is made of a certain amount of gas and dust, and thus it inevitably generates a certain gravity field. When this mass exceeds a fraction of the central mass (about 10% typically), then the departure to the keplerian rotation law is significant: the centrifugal force is no more compensated by the central attraction only but by the combined gravitational attraction of the black hole and of the disc.

The recent findings of nearly matching long-term cyclicity in biological mass extinctions, geomagnetic reversals, impact cratering and other terrestrial processes have evoked a major controversy

The structure and the dynamics of the accretion disc remain quite mysterious.