Results 311 to 320 of about 22,046,683 (361)
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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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2003
In this chapter we give an overview of the properties of our planetary system — both those related to its dynamical structure, namely the orbital and rotational motions of the constituent bodies, and those connected with their physical nature (e.g., size, composition, the presence of an atmosphere and/or of a solid surface).
Paolo Farinella +2 more
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In this chapter we give an overview of the properties of our planetary system — both those related to its dynamical structure, namely the orbital and rotational motions of the constituent bodies, and those connected with their physical nature (e.g., size, composition, the presence of an atmosphere and/or of a solid surface).
Paolo Farinella +2 more
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An old disk still capable of forming a planetary system
Nature, 2013From the masses of the planets orbiting the Sun, and the abundance of elements relative to hydrogen, it is estimated that when the Solar System formed, the circumstellar disk must have had a minimum mass of around 0.01 solar masses within about 100 ...
E. Bergin +13 more
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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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The cosmochemistry of planetary systems
Nature Reviews ChemistryPlanets form and obtain their compositions from the leftover material present in protoplanetary disks of dust and gas surrounding young stars. The chemical make-up of a disk influences every aspect of planetary composition, including their overall chemical properties, volatile content, atmospheric composition and potential for habitability. This Review
Martin Bizzarro +2 more
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Life-cycle assessment to guide solutions for the triple planetary crisis
Nature Reviews Earth & Environment, 2023S. Hellweg +4 more
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Brain and other central nervous system tumor statistics, 2021
Ca-A Cancer Journal for Clinicians, 2021Carol Kruchko +2 more
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