Lavishly illustrated guide, with artist renderings and real photographs, of spacecraft both real and imaginary. Over 150 illustrations, including rare NASA photographs. 128 pgs, Index, Bibliography. This is the First American Edition hardcover in dust jacket.

This book is a comprehensive and coherent introduction to the role of cosmic strings and other topological defects in the universe. After an introduction to standard cosmological theory and the theory of phase transitions in the early universe, the book then describes, in turn, the properties, formation, and cosmological implications of cosmic strings, monopoles, domain walls and textures. It concludes with a chapter considering the role of topological defects in inflationary universe models. Ample introductory material is included to make the book readily accessible. It will be of interest to graduate students and researchers in particle physics, astrophysics and cosmology.

Astronomy is the oldest and most fundamental of the natural sciences. From the early beginnings of civilization astronomers have attempted to explain not only what the Universe is and how it works, but also how it started, how it evolved to the present day, and how it will develop in the future. The author, a well-known astronomer himself, describes the evolution of astronomical ideas, briefly discussing most of the instrumental developments. Using numerous figures to elucidate the mechanisms involved, the book starts with the astronomical ideas of the Egyptian and Mesopotamian philosophers, moves on to the Greek period, and then to the golden age of astronomy, i.e. to Copernicus, Galileo, Kepler, and Newton, and ends with modern theories of cosmology. Written with undergraduate students in mind, this book gives a fascinating survey of astronomical thinking.

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

"This book contains an edition--with an extensive introduction, translation and commentary--of The Light of the World, a text on theoretical astronomy by Joseph Ibn Naḥmias, composed in Judeo-Arabic around 1400 C.E. in the Iberian Peninsula. As the only text on theoretical astronomy written by a Jew in any variety of Arabic, this work is evidence for a continuing relationship between Jewish and Islamic thought in the late fourteenth and early fifteenth centuries. The text's most lasting effect may have been exerted via its passage to Renaissance Italy, where it influenced scholars at the University of Padua in the early sixteenth century. With its crucial role in the development of European astronomy, as well as the physical sciences under Islam and in Jewish culture, The Light of the World is an important episode in Islamic intellectual history, Jewish civilization, and the history of astronomy."--

Text: English, German (translation)

Socrates knew all that was known by his contemporaries. But already in the Middle Ages it was becoming difficult for a single man to have a truly encyclopedic view of all human knowledge. It is true that Pico della Mirandola, Pius II, Leonardo da Vinci, and several other great minds were thoroughly in possession of considerable know ledge, and knew all that one could know, except no doubt for some techniques. The encyclopedists of the 18th century had to be content with an admirable survey: they could not go into details, and their work is a collective one, the specialized science of each collaborator compensating for the insufficiencies of the others. We know very well that our science of today is a science of specialists. Not only is it impossible for anyone person to assimilate the totality of human knowledge, it is impossible even to know ones own discipline perfectly thoroughly. Each year the presses of science pro duce a frightening quantity of printed paper. Even in very limited fields, new journals are created every day, devoted to extremely specialized, often very narrowly defined subjects. It is indeed evident that in a field whose scope extends well beyond astronomical or astrophysical research, it is materially impossible to be informed of everything, even with the richest of libraries at hand.

Volume 92 of the Science and Technology Series From Imagination to Mars Exploration Studies of the Journal of the British Interplanetary Society (Part 2, Base Building, Colonization and Terraformation)

1. Introduction.- 2. Observational Data.- 3. Celestial Mechanics Minimum.- 4. Elementary Particle Dynamics. I Rigid Body Collisions.- 5. Elementary Particle Dynamics. II Ring Cosmogony.- 6. Elementary Particle Dynamics. III Wave, Photometric, and Other Effects.- 7. Collective Dynamics of Disc Particles. I Formalism.- 8. Collective Dynamics of Disc Particles. II Stability Analysis.- 9. Resonance Effects in Planetary Rings. I Spiral Waves.- 10. Resonance Effects in Planetary Rings. II Narrow Ringlets and Satellites.- 11. Formation and Stability of the Uranian Rings.- 12. Origin, Dynamics, and Stability of the Neptunian Rings.- 13. Self-organisation of the Solar System.- 14. Space Studies of the Outer Planets.- Conclusion.- Appendices I. The Possibility of Studying the Dynamics of Astrophysical Discs in a Two-Dimensional Approach.- 1. Introduction.- 2. Original Equations for the "Volume" Functions.- 2.1 Initial Dynamic Equations.- 2.2 Equation of State.- 3. Derivation of the Basic Equations for the "Plane" Functions.- 3.1 Order-of-Magnitude Estimates of the Terms in the Initial Equations.- 3.2 The Two Limiting Cases of Astrophysical Discs.- 3.3 Limitations of the Characteristic Times of Processes Studied in the Two-Dimensional Approximation.- 3.4 Closed System of Integro-differential Equations for a Barotropic Disc.- 4. Closed Set of Differential Equations for a Polytropic Disc in an External Gravitational Field.- 4.1 Derivation of the Two-Dimensional Equations.- 5. Closed Set of Differential Equations for a Polytropic Self-gravitating Disc.- 5.1 Derivation of the Two-Dimensional Equations.- 5.2 Why Does the Gradient of the Plane Pressure Not Have the Physical Meaning of a Force?.- 6. Conclusion.- 1. Derivation of a Closed Set of Integro-differential Equations.- 2. Derivation of the Dispersion Equation Describing the Three-Dimensional Perturbations.- 4. Dispersion Relation for Waves in the Plane of the Disc.- 5. The Role of Perturbations Along the Rotation Axis.- 5.1 Condition for Neglecting Mass Transfer Along the Rotation Axis.- 5.1.1 General Case.- 5.1.2 Isothermal Disc.- 6. Conclusion.- III. Derivation of the Linearised Equations for Oscillations of a Viscous Disc.- 1. Derivation of the Linearised Equations for Oscillations of a Viscous Uniformly Rotating Disc.- 2. Derivation of the Linearised Equations for Oscillations of a Viscous Differentially Rotating Disc of Inelastic Particles with Account of External Matter Fluxes.- 3. Derivation of the General Dispersion Equation.- IV. Evaluating the Gravitational Potential Inside and Outside a Triaxial Ellipsoid.- 1. Potential Inside the Ellipsoid.- 2. Potential Outside the Ellipsoid.- V. A Drift Mechanism for the Formation of the Cassini Division.- 1. Introduction.- 2. Statement of the Problem.- 3. Derivation of the Non-linear Momentum Conservation Equations.- 4. Time-Averaged Non-linear Momentum Conservation Equations.- 5. Absence of Averaged Radial Mass Flux in a Dissipationless Disc. Large-Scale Convection.- 6. Radial Mass Transfer in a Viscous Disc.- 7. Evolution of the Surface Density of a Disc.- 8. Conditions for the Formation of Different Types of Resonant Structures: Gaps or Wavetrains?.- 9. Estimate of the Maximum Width of a Gap Produced by a Density Wave.- 10. Some Additional Remarks.- VI. Resonance Structures in Saturn's C Ring.- References.

This volume explains the dramatic effect of cross-correlations in forming the structural response of aircraft in turbulent excitation, ships in rough seas, cars on irregular roads, and other dynamic regimes. It brings into sharp focus the dramatic effect of cross correlations often neglected due to the analytical difficulty of their evaluation. Veteran author Professor Isaac Elishakoff illustrates how neglect of cross correlations could result in underestimation of the response by tens or hundreds of percentages the effect of the random vibrations of structures' main elements, including beams, plates, and shells. Clarifies the common misconception that natural frequencies of structures are well apart from each other; Illustrates that the interaction of associated modes in plates can dramatically alter the random response due to presence of coinciding frequencies; Demonstrates that natural frequencies in beams on elastic foundation, as well as cylindrical or spherical shells, might cluster together resulting in substantial percentage error if cross-correlations are ignored.

This book represents an authentic reproduction of the text as printed by the original publisher. While we have attempted to accurately maintain the integrity of the original work, there are sometimes problems with the original work or the micro-film from which the books were digitized. This can result in errors in reproduction. Possible imperfections include missing and blurred pages, poor pictures, markings and other reproduction issues beyond our control. Because this work is culturally important, we have made it available as part of our commitment to protecting, preserving and promoting the world's literature. ++++ The below data was compiled from various identification fields in the bibliographic record of this title. This data is provided as an additional tool in helping to insure edition identification: ++++ An ephemeris, or, Almanack for the year of our Lord 1667 being the third after leap-year ... / by John Swan. Swan, John, d. 1671. Running title: Swan 1667. [47] p. [Cambridge, Cambridgeshire] : Printed by John Field ..., 1667. Wing / A2475 English Reproduction of the original in the Harvard University Library ++++ This book represents an authentic reproduction of the text as printed by the original publisher. While we have attempted to accurately maintain the integrity of the original work, there are sometimes problems with the original work or the micro-film from which the books were digitized. This can result in errors in reproduction. Possible imperfections include missing and blurred pages, poor pictures, markings and other reproduction issues beyond our control. Because this work is culturally important, we have made it available as part of our commitment to protecting, preserving and promoting the world's literature.