Results 221 to 230 of about 16,602 (261)

Heat Transfer and Planetary Evolution

Geophysical Surveys, 1984
The object of this account is to show how much one can interprete and predict about the present state of material forming planet size objects, despite the fact we do not and could never have the kind of exact or prior knowledge of initial conditions and in situ material behaviour that would make a formal mathematical analysis of the dynamical problems ...
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Planetary Drill Evolution

7th Symposium on Space Resource Utilization, 2014
subsurface zones of interest for geo scientific studies. For In Situ Resource Utilization (ISRU) purposes, it is important to characterize the form and concentration of the resources available, understand the environment the resource is found in, and adequately validate that the processes required to extract and process the resource will operate in the
Sherry L. Schmidt, Marcel Viel, Tom Atwell   +2 more
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The evolution of planetary orbits

Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences, 1974
Abstract Planets produced by the capture-theory model would condense into compact partially segregated bodies in a period of 103–104 a (years). A resisting medium, which would be a byproduct of the capture process, is shown to give rounding of planetary orbits in 104–108a, the rounding time being dependent on planetary mass.
J. R. Dormand, Michael Mark Woolfson
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Evolution of Planetary Ringmoon Systems

Earth, Moon, and Planets, 1994
The last few decades have seen an avalanche of observations of planetary ring systems, both from spacecraft and from Earth. Meanwhile, we have seen steady progress in our understanding of these systems as our intuition (and our computers) catch up with the myriad ways in which gravity, fluid and statistical mechanics, and electromagnetism can combine ...
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Evolution of planetary nebulae

The Astronomy and Astrophysics Review, 1992
A second argument in this direction was given by several astronomers in the 1950's. It had long been known from the double peaked emission lines observed in the nebulae, that they were expanding. The velocity of expansion is on the average 15 to 20 km s -t, with only exceptional cases differing by more than a factor 2 from this value.
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THEORIES OF PLANETARY EVOLUTION

2010
W e cannot doubt that the solar system, as we see it, is the result of some process of growth–that, during innumerable ages, the forces of Nature were at work upon its materials, blindly modelling them into the shape appointed for them from the beginning by Omnipotent Wisdom.
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The Evolution of Planetary Nebulae

2012
The connection between stars and the gaseous envelopes we now call planetary nebulae was not evident to observers of the past. William Herschel’s 1784 insight was the first step on the road to a fuller understanding. Even today, astronomers are concerned with modeling the minutiae of planetaries, and although we have a far greater understanding than ...
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Planetary Systems: Origin and Evolution

2014
The scenario for the origin and evolution of planetary systems (and in particular, the solar system) is based on fundamental theoretical concepts and astrophysical data involving the process of star formation. Mechanical and cosmochemical properties of the solar system through radioisotope dating place important constraints on such a scenario.
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Evolution of Planetary Interiors

2014
Tosi, Nicola, Breuer, D., Spohn, Tilman
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A dynamic model for the planetary bearings in a double planetary gear set

Mechanical Systems and Signal Processing, 2023
Min Xia, Jing Liu
exaly