منابع مشابه
On the Cosmochemistry of the Moon and Planets
Models of the Jovian interiors are based on theoretical equations of state of hydrogen and helium supported by a few experimental points and on observed parameters such as oblateness, gravitational coefficients, heat emission, magnetic fields etc. The models fall into three categories: (1) those which assume a uniform and rather low H2 /He ratio throughout the planet, (2) those in which this ra...
متن کاملTidal pattern instabilities on multi-moon planets
The equilibrium tide-generating forces in the lunar orbital plane of a planet of radius R are calculated for the case of N moons of mass Mi orbiting the planet at instantaneous polar coordinates (Di, αi). For the case of a single moon, there are only two high tides. For the case of two moons, it is found that there can exist a critical lunar orbital distance at which two high tides become unsta...
متن کاملThe Origin and Evolution of the Moon and Planets
The age of the universe, as it is perceived at present, is perhaps as old as 20 aeons so that the formation of the solar system at about 4.5 aeons is a comparatively youthful event in this stupendous extent of time [I]. Thevisible portion of the universe consists principally of about 10" galaxies, which show local marked irregularities in distribution (e.g., Virgo cluster). The expansion rate (...
متن کاملOrigin of the terrestrial planets and the moon.
Our ideas about the origin and evolution of the solar system have advanced significantly as a result of the past 25 years of space exploration. Metal-sulfide-silicate partitioning seems to have been present in the early dust components of the solar nebula, prior to chondrule formation. The inner solar nebula was depleted in volatile elements by early solar activity. The early formation of the g...
متن کاملAccretion of Terrestrial Planets and the Earth/moon System
Introduction: The leading paradigm for the origin of the terrestrial planets is the planetesimal hypothesis, which proposes that mutual collisions between objects in the protoplanetary disk resulted in the accretional growth of increasingly massive bodies, ending with the formation of planets in the 0.5 to 1.5AU region. Two decades of analytical modeling and numerical simulation have revealed t...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1972
ISSN: 0074-1809
DOI: 10.1017/s0074180900097710