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Additional info for Astronomy Geometrical and Statistical Methods of Analysis of Star Configurations Dating Ptolemys Almagest
Let us now return to the formation of planetary systems, taking the most general possible overall view, without, however, forgetting the need to explain, as a minimum, the formation of the Solar System. Thanks to theoretical models and heavy computations (N-body simulations, where N is of the order of a few thousands), we can distinguish three phases, which take place in parallel, but on timescales that may be very different. Between 1 and 10 Million Years: The Formation of Planetary Embryos Starting at a size of about one kilometer, the nature of the interactions between the bodies changes radically.
But what? A wind or UV photons from the central star itself could “blow away” a circumstellar disk, but theoretical estimates show that this mechanism is not very effective. So the cause of the disappearance of disks might be external: when they are located near massive stars, and thus exposed to strong external UV radiation, calculations show that they may “evaporate” over a period of about a million years. However, the vast majority of disks do not exist in such a situation, which reduces the overall efficiency of such a mechanism.
1007/978-3-642-22552-9_2, © Springer-Verlag Berlin Heidelberg 2012 38 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Chapter 2 • Formation and Early Infancy of the Earth T he Earth is a living planet: its surface is perpetually remodeled by plate tectonics as well as by the surface mechanisms of alteration and erosion. As a result, unlike “dead” bodies such as the Moon, where all the stages of their primitive history have been preserved, practically all the traces of the first 500 million years (Ma) of the Earth’s history have been obliterated.
Astronomy Geometrical and Statistical Methods of Analysis of Star Configurations Dating Ptolemys Almagest by Fomenko-Kalashnikov-Nosovsky