Temperature of the Sun in the Early History of the Solar System

1971 ◽  
Vol 230 (10) ◽  
pp. 40-42 ◽  
Author(s):  
P. K. KURODA
1988 ◽  
Vol 7 (1) ◽  
pp. 38-47
Author(s):  
C. P. Snyman

In view of the principle of actualism the early history of the earth must be explained on the basis of present-day natural phenomena and the basic Laws of Nature. The study of the solar system leads to the conclusion that the planets were formed as by-products when the sun developed from a rotating cloud of cosmic gas and dust. The protoplanets or planetesimals could have accreted as a result of mutual collisions, during which they could have become partly molten so that they could differentiate into a crust, a mantle and a core on the basis of differences in density.


2006 ◽  
Vol 2 (S236) ◽  
pp. 31-34
Author(s):  
E. L. Kiseleva ◽  
V. V. Emel'yanenko

AbstractThe dynamical interrelation between resonant trans-Neptunian objects and short-period comets is studied. Initial orbits of resonant objects are based on computations in the model of the outward transport of objects during Neptune's migration in the early history of the outer Solar system. The dynamical evolution of this population is investigated for 4.5 Gyr, using a symplectic integrator. Our calculations show that resonant trans-Neptunian objects give a substantial contribution to the planetary region. We have estimated that the relative fraction of objects captured per year from the 2/3 resonance to Jupiter-family orbits with perihelion distances q<2.5 AU is 0.4×10−10 near the present epoch.


1974 ◽  
Vol 3 ◽  
pp. 489-489
Author(s):  
M. W. Ovenden

AbstractThe intuitive notion that a satellite system will change its configuration rapidly when the satellites come close together, and slowly when they are far apart, is generalized to ‘The Principle of Least Interaction Action’, viz. that such a system will most often be found in a configuration for which the time-mean of the action associated with the mutual interaction of the satellites is a minimum. The principle has been confirmed by numerical integration of simulated systems with large relative masses. The principle lead to the correct prediction of the preference, in the solar system, for nearly-commensurable periods. Approximate methods for calculating the evolution of an actual satellite system over periods ˜ 109 yr show that the satellite system of Uranus, the five major satellites of Jupiter, and the five planets of Barnard’s star recently discovered, are all found very close to their respective minimum interaction distributions. Applied to the planetary system of the Sun, the principle requires that there was once a planet of mass ˜ 90 Mθ in the asteroid belt, which ‘disappeared’ relatively recently in the history of the solar system.


1986 ◽  
Vol 34 (2) ◽  
pp. 145-154 ◽  
Author(s):  
H. Alfvén ◽  
I. Axnäs ◽  
N. Brenning ◽  
P.A. Lindqvist

Science ◽  
1973 ◽  
Vol 182 (4109) ◽  
pp. 281-283 ◽  
Author(s):  
G. W. Wetherill ◽  
R. Mark ◽  
C. Lee-Hu

2011 ◽  
Vol 33 (2-3) ◽  
pp. 685-721 ◽  
Author(s):  
Philippe Lamy ◽  
Pierre Vernazza ◽  
Joel Poncy ◽  
Vincent Martinot ◽  
Emmanuel Hinglais ◽  
...  

Nature ◽  
1918 ◽  
Vol 101 (2545) ◽  
pp. 447-449 ◽  
Author(s):  
HAROLD JEFFREYS

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