Results 301 to 310 of about 304,444 (325)
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On the Spacing of Planetary Systems
Physical Review Letters, 2000We present a simplified model of planetary accretion based on conservation of mass, conservation of momentum, and angular-momentum-deficit stability. Within the limitations of this model, we show how the organization of generic planetary systems may be derived from the knowledge of their initial mass distribution.
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The formation of the planetary system
Celestial Mechanics, 1984One of the most challenging problems of natural science is the question of how our solar system was formed some 4,6 billion years ago. The main difficulties encountered in trying to find any definite answer to this problem are twofold. In the first place we cannot design direct experiments which could give us clues to the relative importance of the ...
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A Planetary Park system for Mars
Space Policy, 2004The increasing robotic exploration of Mars and eventual human exploration and settlement of that planet threatens to have a significant environmental impact on scientifically important sites and sites of natural beauty in the form of contamination with micro-organisms and spacecraft parts.
Horneck, G., Cockell, C.
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Fluids in Planetary Systems [PDF]
Elements, 2005 Water and other geofluids play an important role in the geochemical and rheological evolution of the Earth and other bodies in the solar system. These fluids are responsible for the formation of hydrothermal mineral deposits, affect eruption behavior in volcanic systems and the geophysical properties of the mantle, and significantly affect the way in ...
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Planetary Systems and Extraterrestrial Life
Origins of Life, 1974The paper reviews the present status of the problem of the existence of other planetary systems in the Galaxy. Observational data and theoretical results are presented to show that the occurrence of planetary systems is, most probably, not a universal phenomenon. Study of the stability of planetary orbits in the vicinity of double stars indicates that,
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Science, 2008
The diversity of extrasolar planets and planetary systems challenges present theories of planetary system formation.
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The diversity of extrasolar planets and planetary systems challenges present theories of planetary system formation.
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ASTRONOMY:Seeking Planetary Systems
Science, 1998Looking for Earths The Race to Find New Solar Systems. Alan Boss. Wiley, New York, 1998. 252 pp. $27.95, C$39.50. ISBN 0-471-18421-7. Written for a general audience, this account of the colorful history of the search for extrasolar planets is presented from the perspectives of a quasi-insider, a theorist who is interested in and has influenced the ...
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