Results 271 to 280 of about 24,424 (315)
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2002
Abstract The material in a given orbit coalesces into a planet for reasons that are not completely clear and, in the case of the Earth, the planet probably underwent a meltdown. The energy for this process came from gravitational potential energy, kinetic energy of the components, heat of radioactive decay and radiant energy from the sun.
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Abstract The material in a given orbit coalesces into a planet for reasons that are not completely clear and, in the case of the Earth, the planet probably underwent a meltdown. The energy for this process came from gravitational potential energy, kinetic energy of the components, heat of radioactive decay and radiant energy from the sun.
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Phase Space Structure Around Planetary Satellites
AIAA/AAS Astrodynamics Specialist Conference and Exhibit, 2004Hill’s equations can be used for approximating the dynamic behavior around many celestial bodies. When considering also the perturbation due to the non-sphericity of the central body, the model closely reproduces the real dynamics of an orbiter around planetary satellites.
Juan San-Juan +2 more
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Planetary structures in general relativity
pure and applied geophysics, 1972For a static single-zone planet assuming that 1) the pressure and density are connected by the equationP =K Q 1+1/n–s, 2) a complete spherical symmetry is preserved and the system is in hydrostatic equilibrium; in section II, the expressions for the field equations have been obtained in suitable dimensionless forms.
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STRUCTURE OF PLANETARY ATMOSPHERES
AIAA Journal, 1963The temperature, composition, pressure, and other properties of the atmospheres of Earth, Mars, Venus, and Jupiter are reviewed in the light of the most recent observational results. Several models for the Venus atmosphere are described. (D.L.C.)
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The Structuring of Planetary Nebulae
AIP Conference Proceedings, 2005This paper discusses some features in Planetary Nebulae and Protoplanetary Nebulae that are addressed by several works on MHD. We review different scenarios for the origin of magnetized winds, either for Protoplanetary Nebulae or Planetary Nebulae, and discusses the production of axisymmetric flows, the confinement of flows and the production of jets ...
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Interpretation and analysis of planetary structures
Journal of Structural Geology, 2010Structural geology is an integral part of planetary science. Planetary structures provide the framework for determining the character and sequence of crustal deformation while simultaneously establishing the observational basis required to test geodynamic hypotheses for the deformation of planetary and satellite lithospheres.
Schultz, Richard A. +4 more
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Vibration Structure of Gyroscopic Planetary Gears
Volume 4: 8th International Conference on Multibody Systems, Nonlinear Dynamics, and Control, Parts A and B, 2011This study investigates the vibration structure of high-speed, gyroscopic planetary gears. The vibration modes of these systems are complex-valued and speed dependent. Three mode types exist, and these are classified as planet, rotational, and translational modes. Each mode type is mathematically proven by the use of a candidate mode method.
Christopher G. Cooley, Robert G. Parker
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Thermal Structure of Planetary Ionospheres
1973Electrons released in the photoionization process due to the absorption of solar XUV radiation in planetary atmospheres may have initially kinetic energies of one to 100 eV. The energy E of photoelectrons resulting from photons of energy h v interacting with an atmospheric constituent whose ionization potential is IP is given by $$E = hv - IP ...
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The Fine Structures of Planetary Nebulae
Astrophysics and Space Science, 2000Most theoretical studies of the dynamics of planetary nebulae assume that the slow ejecta from the red-giant or asymptotic giant branch phase of evolution of the central star is distributed smoothly. We consider briefly the observational evidence for small scale structure in both neutral and ionised PNe gas, examine some of the ways it can be generated
J.E. Dyson +3 more
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The internal structure of planetary bodies
Contemporary Physics, 1972Abstract Each planet in the Solar System is represented as a mechanically spherical cold body, possibly in rotation. It is seen that, on this basis, the properties of the planets can be understood within the already established principles of the physics of matter under high pressures.
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