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Dynamics Of Comets And Asteroids And Their Role In Earth History

Author: Shin Yabushita
Publisher: Springer Science & Business Media
ISBN: 9401713219
Size: 61.37 MB
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The last decade of this century has seen a renewed interest in the dynamics and physics of the small bodies of the Solar System, Asteroids, Comets and Meteors. New observational evidences such as the discovery of the Edgeworth-Kuiper belt, refined numerical tools such as the symplectic integrators, analytical tools such as semi-numerical perturbation algorithms and in general a better understanding of the dynamics of Hamiltonian systems, all these factors have converged to make possible and worthwhile the study, over very long time spans, of these "minor" objects. Also the public, the media and even some political assell}blies have become aware that these "minor" objects of our planetary environnement could become deadly weapons. Apparently they did have a role in Earth history and a role more ominous than "predicting" defeat (or victory, why not?) to batches of credulous rulers. Remembering what may have happened to the dinosaurs but keeping all the discretion necessary to avoid creating irrational scares, it may not be unwise or irrelevant to improve our knowledge of the physics and dynamics of these objects and to study in particular their interactions with our planet.

The Cosmic Serpent

Author: Victor Clube
Publisher: Universe Pub
Size: 56.35 MB
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Argues that comets occasionally strike the Earth causing climatic changes and that they have had a greater effect on human history than previously believed

Hazards Due To Comets And Asteroids

Author: Tom Gehrels
Publisher: University of Arizona Press
ISBN: 9780816515059
Size: 73.26 MB
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In 1993, the U.S. Department of Defense declassified information dealing with frequent explosions in the upper atmosphere caused by meteoric impact. It is estimated that impacts have occurred of a magnitude equivalent to the atomic bomb detonated at Hiroshima. Not all such space voyagers meet their end in the atmosphere, however; huge craters attest to the bombardment of earth over millions of years, and a major impact may have resulted in the extinction of dinosaurs. An impact in Siberia near the beginning of this century proves that such events are not confined to geologic time. Hazards Due to Comets and Asteroids marks a significant step in the attempt to come to grips with the threats posed by such phenomena. It brings together more than one hundred scientists from around the world, who draw on observational and theoretical research to focus on the technical problems related to all aspects of dealing with these hazards: searching for and identifying hazardous comets and asteroids; describing their statistics and characteristics; intercepting and altering the orbits of dangerous objects; and applying existent technologies—rocket boosters, rendezvous and soft-landing techniques, instrumentation—to such missions. The book considers defensive options for diverting or disrupting an approaching body, including solar sails, kinetic-energy impacts, nuclear explosives, robotic mass drivers, and various propulsion systems. A cataclysmic impact posing a threat to life on Earth is a possibility that tomorrow's technology is capable of averting. This book examines in depth the reality of the threat and proposes practical measures that can be initiated now should we ever need to deal with it.

The New Catastrophism

Author: Derek Ager
Publisher: Cambridge University Press
ISBN: 9780521483582
Size: 39.95 MB
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A re-examination of earth history in terms of rare and violent events through geological time.

Perilous Planet Earth

Author: Trevor Palmer
Publisher: Cambridge University Press
ISBN: 9780521819282
Size: 60.43 MB
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A readable 2003 account of the history of natural disasters throughout history.