Results 191 to 200 of about 2,128 (236)
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International Journal of Astrobiology, 2007
AbstractMechanisms of interstellar panspermia have recently been identified whereby life, wherever it has originated, will disperse throughout the habitable zone of the Galaxy within a few billion years. This re-opens the question of where life originated.
W.M. Napier +2 more
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AbstractMechanisms of interstellar panspermia have recently been identified whereby life, wherever it has originated, will disperse throughout the habitable zone of the Galaxy within a few billion years. This re-opens the question of where life originated.
W.M. Napier +2 more
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International Astronomical Union Colloquium, 1976
The cosmogony of the planetary and satellite systems consists of understanding the physio-chemical processes leading to their formation and also trying to decide at what time and over what period their formation took place. The cosmogony of the comets require answers to not only these two questions but also as to where, in relation to the solar system,
Asoka Mendis, Hannes Alfvén
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The cosmogony of the planetary and satellite systems consists of understanding the physio-chemical processes leading to their formation and also trying to decide at what time and over what period their formation took place. The cosmogony of the comets require answers to not only these two questions but also as to where, in relation to the solar system,
Asoka Mendis, Hannes Alfvén
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Nature, 1973
IN so many fields of astrophysics the textbooks and the ordinary review articles have a tendency to present only the ‘generally accepted’ point of view, often not mentioning alternative theories, and even sweeping under the rug those observational facts which are adverse to the dominant view. This also applies to the theory of comets. As the arrival of
HANNES ALFVÉN, ASOKA MENDIS
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IN so many fields of astrophysics the textbooks and the ordinary review articles have a tendency to present only the ‘generally accepted’ point of view, often not mentioning alternative theories, and even sweeping under the rug those observational facts which are adverse to the dominant view. This also applies to the theory of comets. As the arrival of
HANNES ALFVÉN, ASOKA MENDIS
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Origin and evolution of comets
International Astronomical Union Colloquium, 1974AbstractA Monte Carlo study is described that leads to an understanding of the evolution of comets, particularly how the short-period comets can arise. Some results have appeared in the March 1972 issue of Astrophysical Letters, Vol. 10, pages 131–135 (Paper I), but further results are presented here for the first time.This is a report of a particular ...
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Reports on Progress in Physics, 1983
After an introduction to the basic history and morphology of comets, the authors consider cometary motion, the physical properties of the neutral gaseous matter, the nucleus, dust particles, cometary ion origin and interactions with the solar wind, the origin of comets, the relation of comets to other astrophysical bodies and the origin of life.
J A Fernandez, K Jockers
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After an introduction to the basic history and morphology of comets, the authors consider cometary motion, the physical properties of the neutral gaseous matter, the nucleus, dust particles, cometary ion origin and interactions with the solar wind, the origin of comets, the relation of comets to other astrophysical bodies and the origin of life.
J A Fernandez, K Jockers
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2017
It was not only the physical nature of comets that so long remained a mystery. Their origin was also shrouded in obscurity, and the various hypotheses put forward to explain this were to some degree influenced by beliefs about their nature.
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It was not only the physical nature of comets that so long remained a mystery. Their origin was also shrouded in obscurity, and the various hypotheses put forward to explain this were to some degree influenced by beliefs about their nature.
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Kinematics and Physics of Celestial Bodies, 2009
The paper presents a brief history of cometary cosmogony. It discusses critically the eruptive hypothesis, the hypothesis on the relict origin of comets, and the hypothesis on a genetic connection between comets and trans-Plutonian planets. Laplace’s theoretical prediction as to the capture of long-period comets by Jupiter into short-period orbits is ...
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The paper presents a brief history of cometary cosmogony. It discusses critically the eruptive hypothesis, the hypothesis on the relict origin of comets, and the hypothesis on a genetic connection between comets and trans-Plutonian planets. Laplace’s theoretical prediction as to the capture of long-period comets by Jupiter into short-period orbits is ...
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An Interstellar Origin for Comets
1982It is usually supposed that the outer regions of the Oort cloud have been thermalised by the cumulative effect of stellar encounters and that the long-period comets are perturbed into the inner solar system by passing stars. This heating, or relaxation, is a gentle process, Weissman (1980) for example estimating that only ∿ 9% of the primordial comet ...
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2013
Originally published in 1953, this book first sets out some observational facts about comets, then the greater part of the book accounts for their origin and explains how comet tails are formed. The text contains 34 photographs of celebrated comets, including eight of Halley's comet. A comet index is also provided.
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Originally published in 1953, this book first sets out some observational facts about comets, then the greater part of the book accounts for their origin and explains how comet tails are formed. The text contains 34 photographs of celebrated comets, including eight of Halley's comet. A comet index is also provided.
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