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Books > Science & Mathematics > Astronomy, space & time > Theoretical & mathematical astronomy

Machine Learning for Planetary Science (Paperback): Joern Helbert, Mario D'Amore, Michael Aye, Hannah Kerner Machine Learning for Planetary Science (Paperback)
Joern Helbert, Mario D'Amore, Michael Aye, Hannah Kerner
R3,500 Discovery Miles 35 000 Ships in 12 - 17 working days

Machine Learning for Planetary Science presents planetary scientists with a way to introduce machine learning into the research workflow as increasingly large nonlinear datasets are acquired from planetary exploration missions. The book explores research that leverages machine learning methods to enhance our scientific understanding of planetary data and serves as a guide for selecting the right methods and tools for solving a variety of everyday problems in planetary science using machine learning. Illustrating ways to employ machine learning in practice with case studies, the book is clearly organized into four parts to provide thorough context and easy navigation. The book covers a range of issues, from data analysis on the ground to data analysis onboard a spacecraft, and from prioritization of novel or interesting observations to enhanced missions planning. This book is therefore a key resource for planetary scientists working in data analysis, missions planning, and scientific observation.

Keplerian Ellipses (Second Edition) - A student guide to the physics of the gravitational two-body problem (Hardcover, 2nd... Keplerian Ellipses (Second Edition) - A student guide to the physics of the gravitational two-body problem (Hardcover, 2nd edition)
Bruce Cameron Reed
R2,157 Discovery Miles 21 570 Ships in 12 - 17 working days
Basic Physics of Nanoscience - Traditional Approaches and New Aspects at the Ultimate Level (Paperback): Wolfram Schommers Basic Physics of Nanoscience - Traditional Approaches and New Aspects at the Ultimate Level (Paperback)
Wolfram Schommers
R3,935 R3,645 Discovery Miles 36 450 Save R290 (7%) Ships in 12 - 17 working days

Basic Physics of Nanoscience: Traditional Approaches and New Aspects at the Ultimate Level deals with the description of properties at the Nano level and self-organizing quantum processes of Nano systems. The book presents the state of the art as well as theoretical discussions of future developments, beginning with simple Nano systems' sensitivity to small variations in interaction potential compared to bulk cases, and continuing with a discussion of the structure and dynamics of Nano systems as a function of temperature. Additionally, the book analyzes self-organizing quantum processes-which are essential in the design of new Nano systems-in detail, and explores new aspects related to the quantum theoretical nature of time, leading to an expansion of the basic laws through nanotechnology. Finally, the book explores the effect of nanotechnological manipulations of brain functions and the need for the development of reliable models for the matter-mind complex. This innovative approach to understanding Nano systems makes Basic Physics of Nanoscience a vital resource for advanced students and researchers of physics, materials science, and neuroscience.

Expanding Worldviews: Astrobiology, Big History and Cosmic Perspectives (Hardcover, 1st ed. 2021): Ian Crawford Expanding Worldviews: Astrobiology, Big History and Cosmic Perspectives (Hardcover, 1st ed. 2021)
Ian Crawford
R6,169 Discovery Miles 61 690 Ships in 12 - 17 working days

This book collates papers presented at two international conferences (held at the Australian National University in 2018 and Birkbeck College London in 2019) exploring the relationships between big history and astrobiology and their wider implications for society. These two relatively new academic disciplines aim to integrate human history with the wider history of the universe and the search for life elsewhere. The book will show that, despite differences in emphasis, big history and astrobiology share much in common, especially their interdisciplinary approaches and the cosmic and evolutionary perspectives that they both engender. Specifically, the book addresses the unified, all-embracing, nature of knowledge, the impact of big history on humanity and the world at large, the possible impact of SETI on astrobiology and big history, the cultural signature of Earth's inhabitants beyond our own planet, and the political implications of a planetary worldview. The principal readership is envisaged to comprise scholars working in the fields of astrobiology, big history and space exploration interested in forging interdisciplinary links between these diverse topics, together with educators, and a wider public, interested in the societal implications of the cosmic and evolutionary perspectives engendered by research in these fields.

Understanding the Enrichment of Heavy Elements by the Chemodynamical Evolution Models of Dwarf Galaxies (Hardcover, 1st ed.... Understanding the Enrichment of Heavy Elements by the Chemodynamical Evolution Models of Dwarf Galaxies (Hardcover, 1st ed. 2019)
Yutaka Hirai
R4,130 Discovery Miles 41 300 Ships in 12 - 17 working days

This book addresses the mechanism of enrichment of heavy elements in galaxies, a long standing problem in astronomy. It mainly focuses on explaining the origin of heavy elements by performing state-of-the-art, high-resolution hydrodynamic simulations of dwarf galaxies. In this book, the author successfully develops a model of galactic chemodynamical evolution by means of which the neutron star mergers can be used to explain the observed abundance pattern of the heavy elements synthesized by the rapid neutron capture process, such as europium, gold, and uranium in the Local Group dwarf galaxies. The book argues that heavy elements are significant indicators of the evolutionary history of the early galaxies, and presents theoretical findings that open new avenues to understanding the formation and evolution of galaxies based on the abundance of heavy elements in metal-poor stars.

Orbital Relative Motion and Terminal Rendezvous - Analytic and Numerical Methods for Spaceflight Guidance Applications... Orbital Relative Motion and Terminal Rendezvous - Analytic and Numerical Methods for Spaceflight Guidance Applications (Hardcover, 1st ed. 2021)
Jean Albert Kechichian
R5,166 Discovery Miles 51 660 Ships in 12 - 17 working days

This book provides a comprehensive analysis of time-fixed terminal rendezvous around the Earth using chemical propulsion. The book has two main objectives. The first is to derive the mathematics of relative motion in near-circular orbit when subjected to perturbations emanating from the oblateness of the Earth, third-body gravity, and atmospheric drag. The mathematics are suitable for quick trajectory prediction and the creation of computer codes and efficient software to solve impulsive maneuvers and fly rendezvous missions. The second objective of this book is to show how the relative motion theory is applied to the exact precision-integrated, long-duration, time-fixed terminal rendezvous problem around the oblate Earth for the general elliptic orbit case. The contents are both theoretical and applied, with long-lasting value for aerospace engineers, trajectory designers, professors of orbital mechanics, and students at the graduate level and above.

Explaining Lithium Enriched Red Giant Branch Stars (Hardcover, 1st ed. 2018): Claudia Aguilera-Gomez Explaining Lithium Enriched Red Giant Branch Stars (Hardcover, 1st ed. 2018)
Claudia Aguilera-Gomez
R2,927 Discovery Miles 29 270 Ships in 10 - 15 working days

This thesis provides new insights into the seemingly anomalous ubiquity of lithium-rich red giant stars. The theory of stellar evolution, one of the most successful models of modern astrophysics, predicts that red giant stars should display negligible levels of lithium (Li) on their surfaces. However, Li-rich giants, defined as those showing more than three times the Li content of the Sun, are found everywhere astronomers look in apparent defiance of established theory. The author addresses this problem, analyzing the different possible explanations for such an anomaly, which include interaction with a binary companion, the production of Li in the interior of the star with its subsequent transport to stellar exteriors, and the stellar interaction with planets. The author focuses on this last possibility, where the Li enrichment may be due to the ingestion of planets or brown dwarfs as the stars in question grew in size while becoming giants. She shows that this process is indeed able to explain an important fraction of giants with Li levels above the three times solar threshold, but that some other mechanism is needed to explain the remaining fraction. While this is an important discovery in its own right, the result that makes this thesis groundbreaking is its demonstration that the threshold between Li-normal and Li-rich is mass dependent rather than a fixed proportion of the Sun's content. This corrects a fundamental misapprehension of the phenomenon and opens up a new framework in which to understand and solve the problem. Finally, the author presents interesting observational applications and samples with which to test this new approach to the problem of Li enrichment in giants.

Gravity and the Quantum - Pedagogical Essays on Cosmology, Astrophysics, and Quantum Gravity (Hardcover, 1st ed. 2017): Jasjeet... Gravity and the Quantum - Pedagogical Essays on Cosmology, Astrophysics, and Quantum Gravity (Hardcover, 1st ed. 2017)
Jasjeet Singh Bagla, Sunu Engineer
R4,429 Discovery Miles 44 290 Ships in 12 - 17 working days

This book provides a compilation of in-depth articles and reviews on key topics within gravitation, cosmology and related issues. It is a celebratory volume dedicated to Prof. Thanu Padmanabhan ("Paddy"), the renowned relativist and cosmologist from IUCAA, India, on the occasion of his 60th birthday. The authors, many of them leaders of their fields, are all colleagues, collaborators and former students of Paddy, who have worked with him over a research career spanning more than four decades. Paddy is a scientist of diverse interests, who attaches great importance to teaching. With this in mind, the aim of this compilation is to provide an accessible pedagogic introduction to, and overview of, various important topics in cosmology, gravitation and astrophysics. As such it will be an invaluable resource for scientists, graduate students and also advanced undergraduates seeking to broaden their horizons.

Planetary Giant Impacts - Simulating Collisions and Their Consequences (Hardcover, 1st ed. 2020): Jacob Kegerreis Planetary Giant Impacts - Simulating Collisions and Their Consequences (Hardcover, 1st ed. 2020)
Jacob Kegerreis
R2,927 Discovery Miles 29 270 Ships in 10 - 15 working days

Based on 3D smoothed particle hydrodynamics simulations performed with unprecedented high resolution, this book examines the giant impacts that dominate many planets' late accretion and evolution. The numerical methods developed are now publicly available, greatly facilitating future studies of planetary impacts in our solar system and exoplanetary systems. The book focuses on four main topics: (1) The development of new methods to construct initial conditions as well as a hydrodynamical simulation code to evolve them, using 1000 times more simulation particles than the previous standard. (2) The numerical convergence of giant impact simulations -- standard-resolution simulations fail to converge on even bulk properties like the post-impact rotation period. (3) The collision thought to have knocked over the planet Uranus causing it to spin on its side. (4) The erosion of atmospheres by giant impacts onto terrestrial planets, and the first full 3D simulations of collisions in this regime.

Galileo Galilei - At the Threshold of the Scientific Age (Hardcover, 1st ed. 2018): Wolfgang W. Osterhage Galileo Galilei - At the Threshold of the Scientific Age (Hardcover, 1st ed. 2018)
Wolfgang W. Osterhage
R2,112 Discovery Miles 21 120 Ships in 12 - 17 working days

This new scientific biography explores the influences on, and of, Galileo's exceptional work, thereby revealing novel connections with the worldviews of his age and beyond. Galileo Galilei's contribution to science is unquestionable. And his conflict with the church establishment of his time is no less famous. In this book, authored by a physicist and history scholar, Galileo's life and work are described against a backdrop of the prior scientific state of the art in his various fields of achievement. Particular emphasis is placed on Galileo's vision of the world in relation to historic and also future cosmological models. The impact of his discoveries and theories for the later development of physics and astronomy is a further focus of the narrative.

Jaghmini's Mulakhkhas - An Islamic Introduction to Ptolemaic Astronomy (English, Arabic, Hardcover, 1st ed. 2016): Sally... Jaghmini's Mulakhkhas - An Islamic Introduction to Ptolemaic Astronomy (English, Arabic, Hardcover, 1st ed. 2016)
Sally P. Ragep
R3,935 Discovery Miles 39 350 Ships in 12 - 17 working days

This book provides the only critical edition and English translation of Mahmud al-Jaghmini's al-Mulakhkhas fi al-hay'a al-basita, the most widely circulated Arabic treatise on Ptolemaic astronomy ever written. Composed in the early 13th century, this introductory textbook played a crucial role in the teaching, dissemination, and institutional instruction of Islamic astronomy well into the 19th century (and beyond). Establishing the base text is a fundamental prerequisite for gaining insights into what was considered an elementary astronomical textbook in Islam and also for understanding the extensive commentary tradition that built upon it. Within this volume, the Mulakhkhas is situated within the broader context of the genre of literature termed 'ilm al-hay'a, which has become the subject of intensive research over the past 25 years. In so doing, it provides a survey of summary accounts of theoretical astronomy of Jaghmini's predecessors, both Ancient and Islamic, which could have served as potential sources for the Mulakhkhas. Jaghmini's dates (which until now remained unsettled) are established, and it is definitively shown that he composed not only the Mulakhkhas but also other scientific treatises, including the popular medical treatise al-Qanunca, during a period that has been deemed one of scientific decline and stagnation in Islamic lands. The book will be of particular interest to scholars engaged in the study of Islamic theoretical astronomy, but is accessible to a general readership interested in learning what constituted an introduction to Ptolemaic astronomy in Islamic lands.

Differential Rotation in Sun-like Stars from Surface Variability and Asteroseismology (Hardcover, 1st ed. 2017): Martin Bo... Differential Rotation in Sun-like Stars from Surface Variability and Asteroseismology (Hardcover, 1st ed. 2017)
Martin Bo Nielsen
R2,927 Discovery Miles 29 270 Ships in 10 - 15 working days

In his PhD dissertation Martin Bo Nielsen performs observational studies of rotation in stars like the Sun. The interior rotation in stars is thought to be one of the driving mechanisms of stellar magnetic activity, but until now this mechanism was unconstrained by observational data. NASA's Kepler space mission provides high-precision observations of Sun-like stars which allow rotation to be inferred using two independent methods: asteroseismology measures the rotation of the stellar interior, while the brightness variability caused by features on the stellar surface trace the rotation of its outermost layers. By combining these two techniques Martin Bo Nielsen was able to place upper limits on the variation of rotation with depth in five Sun-like stars. These results suggest that the interior of other Sun-like stars also rotate in much the same way as our own Sun.

The XVIII International Conference on Strangeness in Quark Matter (SQM 2019) (Hardcover, 1st ed. 2020): Domenico Elia, Giuseppe... The XVIII International Conference on Strangeness in Quark Matter (SQM 2019) (Hardcover, 1st ed. 2020)
Domenico Elia, Giuseppe E. Bruno, Pietro Colangelo, Leonardo Cosmai
R4,517 Discovery Miles 45 170 Ships in 12 - 17 working days

This book focuses on new experimental and theoretical advances concerning the role of strange and heavy-flavour quarks in high-energy heavy-ion collisions and in astrophysical phenomena. The topics covered include * Strangeness and heavy-quark production in nuclear collisions and hadronic interactions, * Hadron resonances in the strongly-coupled partonic and hadronic medium, * Bulk matter phenomena associated with strange and heavy quarks, * QCD phase structure, * Collectivity in small systems, * Strangeness in astrophysics,* Open questions and new developments.

Experiments in Reduced Gravity - Sediment Settling on Mars (Paperback): Nikolaus Kuhn Experiments in Reduced Gravity - Sediment Settling on Mars (Paperback)
Nikolaus Kuhn
R628 Discovery Miles 6 280 Ships in 12 - 17 working days

"Experiments in Reduced Gravity: Sediment Settling on Mars" is the first book to be published that reflects experiments conducted on Martian geomorphology in reduced gravity.

This brief yet important book on sediment experiments assesses the theoretical and empirical foundation of the models used to analyze the increasing information we have on the past geography on Mars. The book also evaluates the need to develop new methods for analyzing new information by providing a conceptual outline and a case study on how experiments can be used to test current theoretical considerations. The conceptual approach to identifying the need for and role of experiments will be of interest to planetary scientists and geoscientists not necessarily involved with Mars, but those using experiments in their research who can apply the book s concepts.
Includes figures, diagrams, illustrations, and photographs to vividly explore experiments and outcomes in reduced gravityProvides an outline of planned experiments and questions related to Martian geomorphologyFeatures results from the MarsSedEx 1 Experiment in 2012"

Beyond  CDM - Exploring Alternatives to the Standard Cosmological Paradigm (Hardcover, 1st ed. 2018): Sownak Bose Beyond CDM - Exploring Alternatives to the Standard Cosmological Paradigm (Hardcover, 1st ed. 2018)
Sownak Bose
R2,935 Discovery Miles 29 350 Ships in 10 - 15 working days

This book employs computer simulations of 'artificial' Universes to investigate the properties of two popular alternatives to the standard candidates for dark matter (DM) and dark energy (DE). It confronts the predictions of theoretical models with observations using a sophisticated semi-analytic model of galaxy formation. Understanding the nature of dark matter (DM) and dark energy (DE) are two of the most central problems in modern cosmology. While their important role in the evolution of the Universe has been well established-namely, that DM serves as the building blocks of galaxies, and that DE accelerates the expansion of the Universe-their true nature remains elusive. In the first half, the authors consider 'sterile neutrino' DM, motivated by recent claims that these particles may have finally been detected. Using sophisticated models of galaxy formation, the authors find that future observations of the high redshift Universe and faint dwarf galaxies in the Local Group can place strong constraints on the sterile neutrino scenario. In the second half, the authors propose and test novel numerical algorithms for simulating Universes with a 'modified' theory of gravity, as an alternative explanation to accelerated expansion. The authors' techniques improve the efficiency of these simulations by more than a factor of 20 compared to previous methods, inviting the readers into a new era for precision cosmological tests of gravity.

Bayesian Methods for the Physical Sciences - Learning from Examples in Astronomy and Physics (Hardcover, 2015 ed.): Stefano... Bayesian Methods for the Physical Sciences - Learning from Examples in Astronomy and Physics (Hardcover, 2015 ed.)
Stefano Andreon, Brian Weaver
R3,840 Discovery Miles 38 400 Ships in 12 - 17 working days

Statistical literacy is critical for the modern researcher in Physics and Astronomy. This book empowers researchers in these disciplines by providing the tools they will need to analyze their own data. Chapters in this book provide a statistical base from which to approach new problems, including numerical advice and a profusion of examples. The examples are engaging analyses of real-world problems taken from modern astronomical research. The examples are intended to be starting points for readers as they learn to approach their own data and research questions. Acknowledging that scientific progress now hinges on the availability of data and the possibility to improve previous analyses, data and code are distributed throughout the book. The JAGS symbolic language used throughout the book makes it easy to perform Bayesian analysis and is particularly valuable as readers may use it in a myriad of scenarios through slight modifications. This book is comprehensive, well written, and will surely be regarded as a standard text in both astrostatistics and physical statistics. Joseph M. Hilbe, President, International Astrostatistics Association, Professor Emeritus, University of Hawaii, and Adjunct Professor of Statistics, Arizona State University

Quantum Enhancement of a 4 km Laser Interferometer Gravitational-Wave Detector (Hardcover, 2015 ed.): Sheon S. Y. Chua Quantum Enhancement of a 4 km Laser Interferometer Gravitational-Wave Detector (Hardcover, 2015 ed.)
Sheon S. Y. Chua
R3,456 Discovery Miles 34 560 Ships in 12 - 17 working days

The work in this thesis was a part of the experiment of squeezed light injection into the LIGO interferometer. The work first discusses the detailed design of the squeezed light source which would be used for the experiment. The specific design is the doubly-resonant, traveling-wave bow-tie cavity squeezed light source with a new modified coherent sideband locking technique. The thesis describes the properties affecting the squeezing magnitudes and offers solutions which improve the gain. The first part also includes the detailed modeling of the back-scattering noise of a traveling Optical Parametric Oscillator (OPO). In the second part, the thesis discusses the LIGO Squeezed Light Injection Experiment, undertaken to test squeezed light injection into a 4km interferometric gravitational wave detector. The results show the first ever measurement of squeezing enhancement in a full-scale suspended gravitational wave interferometer with Fabry-Perot arms. Further, it showed that the presence of a squeezed-light source added no additional noise in the low frequency band. The result was the best sensitivity achieved by any gravitational wave detector. The thesis is very well organized with the adequate theoretical background including basics of Quantum Optics, Quantum noise pertaining to gravitational wave detectors in various configurations, along with extensive referencing necessary for the experimental set-up. For any non-experimental scientist, this introduction is a very useful and enjoyable reading. The author is the winner of the 2013 GWIC Theses Prize.

Saturation of the f-mode Instability in Neutron Stars (Hardcover, 1st ed. 2018): Pantelis Pnigouras Saturation of the f-mode Instability in Neutron Stars (Hardcover, 1st ed. 2018)
Pantelis Pnigouras
R2,943 Discovery Miles 29 430 Ships in 10 - 15 working days

This book presents a study of the saturation of unstable f-modes (fundamental modes) due to low-order nonlinear mode coupling. Since their theoretical prediction in 1934, neutron stars have remained among the most challenging objects in the Universe. Gravitational waves emitted by unstable neutron star oscillations can be used to obtain information about their inner structure, that is, the equation of state of dense nuclear matter. After its initial growth phase, the instability is expected to saturate due to nonlinear effects. The saturation amplitude of the unstable mode determines the detectability of the generated gravitational-wave signal, but also affects the evolution of the neutron star. The study shows that the unstable (parent) mode resonantly couples to pairs of stable (daughter) modes, which drain the parent's energy and make it saturate via a mechanism called parametric resonance instability. Further, it calculates the saturation amplitude of the most unstable f-mode multipoles throughout their so-called instability windows.

Orbits - 2nd Order Singularity-free Solutions (Hardcover, 2nd ed. 2013): Guochang Xu, Jia Xu Orbits - 2nd Order Singularity-free Solutions (Hardcover, 2nd ed. 2013)
Guochang Xu, Jia Xu
R4,834 R3,694 Discovery Miles 36 940 Save R1,140 (24%) Ships in 12 - 17 working days

The development of the orbits theory lags behind the development of satellite technology. This book provides, for the first time in the history of human satellite development, the complete third order solution of the orbits under all possible disturbances. It describes the theory of satellite orbits, derives the complete solutions of the orbital disturbances, describes the algorithms of orbits determination based on the theory, describes the applications of the theory to the phenomenon of the satellite formation physically. The subjects include: Orbits Motion Equations, Disturbance theory, Solutions of the differential Equations, Algorithms of Orbits determinations, Applications of the theory to the satellite formation.

The Cosmic Microwave Background - Proceedings of the II Jose Plinio Baptista School of Cosmology (Hardcover, 1st ed. 2016):... The Cosmic Microwave Background - Proceedings of the II Jose Plinio Baptista School of Cosmology (Hardcover, 1st ed. 2016)
Julio C. Fabris, Oliver Piattella, Davi C. Rodrigues, Hermano E.S. Velten, Winfried Zimdahl
R7,312 Discovery Miles 73 120 Ships in 12 - 17 working days

The series of texts composing this book is based on the lectures presented during the II Jose Plinio Baptista School of Cosmology, held in Pedra Azul (Espirito Santo, Brazil) between 9 and 14 March 2014. This II JBPCosmo has been entirely devoted to the problem of understanding theoretical and observational aspects of Cosmic Background Radiation (CMB).The CMB is one of the most important phenomena in Physics and a fundamental probe of our Universe when it was only 400,000 years old. It is an extraordinary laboratory where we can learn from particle physics to cosmology; its discovery in 1965 has been a landmark event in the history of physics.The observations of the anisotropy of the cosmic microwave background radiation through the satellites COBE, WMAP and Planck provided a huge amount of data which are being analyzed in order to discover important informations regarding the composition of our universe and the process of structure formation.

Introduction to General Relativity and Cosmology (Second Edition) (Hardcover, 2nd edition): Ian R. Kenyon Introduction to General Relativity and Cosmology (Second Edition) (Hardcover, 2nd edition)
Ian R. Kenyon
R2,153 Discovery Miles 21 530 Ships in 12 - 17 working days
In Search of William Gascoigne - Seventeenth Century Astronomer (Hardcover, 2012 ed.): David Sellers In Search of William Gascoigne - Seventeenth Century Astronomer (Hardcover, 2012 ed.)
David Sellers
R2,940 Discovery Miles 29 400 Ships in 10 - 15 working days

William Gascoigne (c.1612-44) was the inventor of the telescopic sight and micrometer (instruments crucial to the advance of astronomy). His name is now known to historians of science around the world. For some considerable time after his tragic death at the age of 32 in the English Civil War, however, it seemed as if his achievements would be consigned to oblivion. Most of his papers were lost and even the few that survived have largely disappeared. This is the story of how his work was rescued. Into this story is woven an account of the state of astronomy and optics during Gascoigne's lifetime, so that the reader can appreciate the significance of his discoveries.

Stellar Disk Evolution and Gaseous Disk Turbulence of Dwarf Irregular Galaxies (Hardcover, 1st ed. 2016): Hong-Xin Zhang Stellar Disk Evolution and Gaseous Disk Turbulence of Dwarf Irregular Galaxies (Hardcover, 1st ed. 2016)
Hong-Xin Zhang
R3,397 Discovery Miles 33 970 Ships in 12 - 17 working days

This book focuses on the stellar disk evolution and gas disk turbulence of the most numerous galaxies in the local Universe - the dwarf galaxies. The "outside-in" disk shrinking mode was established for a relatively large sample of dwarf galaxies for the first time, and this is in contrast to the "inside-out" disk growth mode found for spiral galaxies. Double exponential brightness profiles also correspond to double exponential stellar mass profiles for dwarf galaxies, which is again different from most spiral galaxies. The cool gas distribution in dwarf galaxies was probed with the spatial power spectra of hydrogen iodide (HI) gas emission, and provided indirect evidence that inner disks of dwarf galaxies have proportionally more cool gas than outer disks. The finding that no correlation exists between gas power spectral indices and star formation gave important constraints on the relation between turbulence and star formation in dwarf galaxies.

Copernicus and his Successors (Hardcover): Edwards Rosen Copernicus and his Successors (Hardcover)
Edwards Rosen
R3,783 Discovery Miles 37 830 Ships in 12 - 17 working days

The essays in Copernirus and his Successors deal both with the influences on Copernicus, including that of Greek and Arabic thinkers, and with his own life and attitudes. They also examine how he was seen by contemporaries and finally describe his relationship to other scientists, including Galileo, Brahe and Kepler.

Jean-Charles Houzeau's Escape from Texas - A Belgian Astronomer Caught in the American Civil War (Hardcover, 1st ed.... Jean-Charles Houzeau's Escape from Texas - A Belgian Astronomer Caught in the American Civil War (Hardcover, 1st ed. 2020)
Christiaan Sterken, Amy Abercrombie King
R1,536 Discovery Miles 15 360 Ships in 10 - 15 working days

Translated from the original French and annotated with figures, historical maps and commentary from the translators, this work is Jean-Charles Houzeau's account of his escape from Texas during the American Civil War. Houzeau was a Belgian astronomer who worked a couple of years as assistant astronomer at the Brussels Observatory, but eventually moved to the United States. He was living as a frontierman in Texas when the Civil War broke out, and because he took an abolitionist stance and helped slaves escape, he was forced to flee to Mexico, from where he sailed to New Orleans on board of a US military vessel. Originally titled La terreur blanche au Texas et mon 'evasion, Houzeau captured the details of his escape in 1862.The editors, an astronomer and a French language teacher, have added supplementary material to give the readers more depth and historical context to the story.

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