Comets are small bodies, but of great cosmic relevance. Given its pristine nature, they may preserve valuable and unique information on thechemical and physical processes that took place in theearly solar system, and that may be occurring in the formation of other planetary systems. They might have even played a very important role in the origin of life on Earth. Beyond that, since ancient times comets have inspired awe, superstition, and also curiosity anddebate. Their sudden apparitions challenged the long-held view of the immutability of the heavens, which triggered a long debate on whether comets had a heavenly or terrestrial nature. Therefore, comets have a prominent role in the history of scienti?cthought, that goes back to the most ancient civilizations. The last apparition of comet Halley in 1986 was a landmark since it arouse a great expectation in the scienti?c community and in the public at large. For the ?rst time, a ?otilla of spacecrafts visited a comet. Agreat number of popular and technical books were written on Halley, and comets in general, around the mid-eighties. The interest in comets never subsided after Halley's passage which is re?ected in the large volume of printed material on these bodies. I have taken the challenge to write a new book on comets that summarizes most of the recent advances on thesubject, including my own workdeveloped during the last 25 years.

Since the discovery of the first exoplanet orbiting a main sequence star in 1995, nearly 500 planets have been detected, with this number expected to increase dramatically as new ground-based planetary searches begin to report their results. Emerging techniques offer the tantalizing possibility of detecting an Earth-mass planet in the habitable zone of a solar-type star as well as the exciting prospect of studying exoplanetary atmospheres that could reveal the presence of biomarkers, such as water vapor, oxygen, and carbon dioxide. Can we find the "Holy Grail" of exoplanets? Cutting-edge research may reveal the answer Written by internationally renowned scientists at the forefront of the field, Extra-Solar Planets: The Detection, Formation, Evolution and Dynamics of Planetary Systems presents powerful analytical tools and methods for investigating extra-solar planetary systems. It discusses new theories on planetary migration and resonant capture that elucidate the existence of "hot Jupiters." It also examines the astrophysical mechanisms required to assemble gas giant planets close to their parent star. In addition, the expert contributors describe how mathematical tools involving periodicity, chaos, and resonance are used to study the diversity and stability of observed planetary systems. By presenting the fundamental analyses that underpin modern studies of extra-solar planetary systems, this graduate-level book enables readers to thoroughly understand important recent developments and offers a platform for future research. It also improves readers' understanding of our own solar system and its place in the diverse range of planetary systems discovered so far.

The experiences and challenges undertaken by C. Piazzi Smyth during his expedition to Tenerife on behalf of the Astronomer Royal are richly depicted and illustrated in this descriptive report of a major scientific expedition's course. The experiment was 'to ascertain how far astronomical observation can be improved, by eliminating the lower third part of the atmosphere'. This account of the data collection process details the flexibility and adjustments that were required throughout the course of this experiment, and the practical organisational difficulties and delights of leading such an expedition. The joys and interest of travelling in a foreign land are described with anecdotes of the people, flora, fauna and geography; particularly the research area, a volcano. Although first published in 1858 this detailed account of the experience of collecting precise scientific data in a challenging environment provides fascinating insights for any scientist undertaking research in the wild.

Research on extrasolar planets is one of the most exciting fields of activity in astrophysics. In a decade only, a huge step forward has been made from the early speculations on the existence of planets orbiting "other stars" to the first discoveries and to the characterization of extrasolar planets. This breakthrough is the result of a growing interest of a large community of researchers as well as the development of a wide range of new observational techniques and facilities.

Based on their lectures given at the 31st Saas-Fee Advanced Course, Andreas Quirrenbach, Tristan Guillot and Pat Cassen have written up up-to-date comprehensive lecture notes on the "Detection and Characterization of Extrasolar Planets," "Physics of Substellar Objects Interiors, Atmospheres, Evolution" and "Protostellar Disks and Planet Formation." This book will serve graduate students, lecturers and scientists entering the field of extrasolar planets as detailed and comprehensive introduction.

Sir George Darwin (1845-1912) was the second son and fifth child of Charles Darwin. After studying mathematics at Cambridge he read for the Bar, but soon returned to science and to Cambridge, where in 1883 he was appointed Plumian Professor of Astronomy and Experimental Philosophy. His family home is now the location of Darwin College. His work was concerned primarily with the effect of the sun and moon on tidal forces on Earth, and with the theoretical cosmogony which evolved from practical observation: he formulated the fission theory of the formation of the moon (that the moon was formed from still-molten matter pulled away from the Earth by solar tides). He also developed a theory of evolution for the Sun-Earth-Moon system based on mathematical analysis in geophysical theory. This volume of his collected papers covers oceanic tides and lunar disturbances of gravity.

Sir George Darwin (1845-1912) was the second son and fifth child of Charles Darwin. After studying mathematics at Cambridge he read for the Bar, but soon returned to science and to Cambridge, where in 1883 he was appointed Plumian Professor of Astronomy and Experimental Philosophy. His family home is now the location of Darwin College. His work was concerned primarily with the effect of the sun and moon on tidal forces on Earth, and with the theoretical cosmogony which evolved from practical observation: he formulated the fission theory of the formation of the moon (that the moon was formed from still-molten matter pulled away from the Earth by solar tides). He also developed a theory of evolution for the Sun-Earth-Moon system based on mathematical analysis in geophysical theory. This volume of his collected papers covers tidal friction and cosmogony.

Sir George Darwin (1845-1912) was the second son of Charles Darwin. After studying mathematics at Cambridge he read for the Bar, but soon returned to science and to Cambridge, where in 1883 he was appointed Plumian Professor of Astronomy and Experimental Philosophy. His work was concerned primarily with the effect of the sun and moon on tidal forces on Earth, and with the theoretical cosmogony which evolved from practical observation: he formulated the fission theory of the formation of the moon (that the moon was formed from still-molten matter pulled away from the Earth by solar tides). He also developed a theory of evolution for the Sun-Earth-Moon system based on mathematical analysis in geophysical theory. This volume, published in 1916 after the author's death, includes a biographical memoir by his brother Sir Francis Darwin, his inaugural lecture and his lectures on George W. Hill's lunar theory.

Sir George Darwin (1845-1912) was the second son and fifth child of Charles Darwin. After studying mathematics at Cambridge he read for the Bar, but soon returned to science and to Cambridge, where in 1883 he was appointed Plumian Professor of Astronomy and Experimental Philosophy. His family home is now the location of Darwin College. His work was concerned primarily with the effect of the sun and moon on tidal forces on Earth, and with the theoretical cosmogony which evolved from practical observation: he formulated the fission theory of the formation of the moon (that the moon was formed from still-molten matter pulled away from the Earth by solar tides). He also developed a theory of evolution for the Sun-Earth-Moon system based on mathematical analysis in geophysical theory. This volume of his collected papers covers figures of equilibrium of rotating liquid and geophysical investigations.

Sir George Darwin (1845-1912) was the second son and fifth child of Charles Darwin. After studying mathematics at Cambridge he read for the Bar, but soon returned to science and to Cambridge, where in 1883 he was appointed Plumian Professor of Astronomy and Experimental Philosophy. His family home is now the location of Darwin College. His work was concerned primarily with the effect of the sun and moon on tidal forces on Earth, and with the theoretical cosmogony which evolved from practical observation: he formulated the fission theory of the formation of the moon (that the moon was formed from still-molten matter pulled away from the Earth by solar tides). This volume of his collected papers covers periodic orbits and some miscellaneous papers, including two investigating the health statistics of the marriage of first cousins - of interest to a member of a dynasty in which such marriages were common.

In The Smallest Lights in the Universe, MIT astrophysicist Sara Seager interweaves the story of her search for meaning and solace after losing her first husband to cancer, her unflagging search for an Earth-like exoplanet and her unexpected discovery of new love. Sara Seager has made it her life's work to peer into the spaces around stars – looking for exoplanets outside our solar system, hoping to find the one-in-a-billion world enough like ours to sustain life. But with the unexpected death of her husband, her life became an empty, lightless space. Suddenly, she was the single mother of two young boys, a widow at forty, clinging to three crumpled pages of instructions her husband had written for things like grocery shopping – things he had done while she did pioneering work as a planetary scientist at MIT. She became painfully conscious of her Asperger's, which before losing her husband had felt more like background noise. She felt, for the first time, alone in the universe. In this probing, invigoratingly honest memoir, Seager tells the story of how, as she stumblingly navigated the world of grief, she also kept looking for other worlds. She continues to develop ground-breaking projects, such as the Starshade, a sunflower-shaped instrument that, when launched into space, unfurls itself so as to block planet-obscuring starlight, and she takes solace in the alien beauty of exoplanets. At the same time, she discovers what feels every bit as wondrous: other people, reaching out across the space of her grief. Among them are the Widows of Concord, a group of women offering consolation and advice, and her beloved sons, Max and Alex. Most unexpected of all, there is another kind of one-in-a-billion match with an amateur astronomer. Equally attuned to the wonders of deep space and human connection, The Smallest Lights in the Universe is its own light in the dark.

Instead of taking somebody's word for it about the basic size and distance statistics for the solar system, this book shows amateur astronomers how to measure these things for themselves. This is an enriching experience for any amateur astronomer - to understand and personally measure some fundamental astronomical quantities and distances.

A basic knowledge of geometry is required, but it is amazing how simple the geometry can be. Readers are led through the geometry as gently as possible - and in a light-hearted way - presuming that most non-academics will have half-forgotten most of their mathematics.

The practical astronomical equipment recommended is no more than a typical commercially-made amateur telescope and a camera of some sort - these days a webcam works very well. Apart from that all the reader will need is access to a computer, the know-how to download free software, and an enthusiasm to expand his knowledge of the basis of scientific astronomy.

Where did we come from? Before there was life there had to be something to live on - a planet, a solar system. During the past 200 years, astronomers and geologists have developed and tested several different theories about the origin of the solar system and the nature of the Earth. Did the Earth and other planets form as a by-product of a natural process that formed the Sun? Did the solar system come into being as the result of catastrophic encounter of two stars? Is the inside of the Earth solid, liquid or gaseous? The three volumes that make up A History of Modern Planetary Physics present a survey of these theories. Nebulous Earth follows the development of the nineteenth-century's most popular explanation for the origin of the solar system, Laplace's Nebular Hypothesis. This theory supposes that a flattened mass of gas extending beyond Neptune's orbit cooled and shrank, throwing off in the process successive rings that in time coalesced to form several planets.

This is the ultimate, easy-to-read guide for "eclipse-chasers" which includes everything an eclipse chaser needs. There are some important eclipses coming up in the years ahead and the technology available to amateur astronomers is improving fast. The book provides "eclipse virgins" with a good feeling for what a trip abroad to an eclipse is like including a humorous look at all the things that can and have gone wrong. Travel details are included, essential in these days of high-security. And of course the first part of the book contains a wealth of information about solar eclipses and what can be observed only during a total eclipse.

Canadian academic Martin Beech has written a text that attempts to cross the line between science fiction and science fact. Put simply, his book details a method that just might be able to stop the Sun from losing its power and, ultimately, save humanity and the Earth itself. It investigates the idea that the distant future evolution of our Sun might be controlled (or 'asteroengineered') so that it maintains its present-day energy output rather than becoming a bloated red giant star: a process that would destroy all life on Earth.

This book provides a concise but broad overview of the engineering, science and flight history of planetary landers and atmospheric entry probes designed to explore the atmospheres and surfaces of other planets. It covers engineering aspects specific to such vehicles which are not usually treated in traditional spacecraft engineering texts. Examples are drawn from over thirty different lander and entry probe designs that have been used for lunar and planetary missions since the early 1960s. The authors provide detailed illustrations of many vehicle designs from different international space programs, and give basic information on their missions and payloads, irrespective of the mission's success or failure. Several missions are discussed in more detail to demonstrate the broad range of the challenges involved and the solutions implemented. This will form an important reference for professionals, academic researchers and graduate students involved in planetary science, aerospace engineering and space mission development.

*Brings the story of the Cassini-Huygens mission and their joint exploration of the Saturnian system right up to date.

*Combines a review of previous knowledge of Saturn, its rings and moons, including Titan, with new spacecraft results in one handy volume.

*Provides the latest and most spectacular images, which will never have appeared before in book form.

*Gives a context to enable the reader to more easily appreciate the stream of discoveries that will be made by the Cassini-Huygens mission.

*Tells the exciting story of the Huygens spacecraft 's journey to the surface of Titan.

A critical issue which is fundamentally affecting the development of the Earth Observation sector is not so much the technology but the data policy. The conditions which govern access to the data, distribution of the data and the price of the data are now vital to the exploitation of this important environmental data resource. This book examines and analyses these data policy issues and recommends how the Earth observation sector can best develop appropriate and useful policies so that the scientific, operational and commercial value of the data can be maximised. This book provides a summary of the influences on Earth observation data policy and a review of the main organisations which develop Earth observation data policy including the United States, the committee on Earth Observation Satellites, the International Earth Observing System and space agencies such as the European Space Agency. The book analyses four key parts to Earth observation data policy: access to Earth observation data, data protection, pricing policy and data preservation. Details of the satellite Earth observation systems of the United States, Europe, Japan, Canada and other nations are included throughout the book. In preparing the book the author has interviewed over 70 experts in Earth observation data policy in Europe, the United States and Canada.

MARSWALK ONE: First Steps on a New Planet addresses the question of why we should embark on a journey to Mars, documenting what the first human crew will do when they place their feet in the red dust of the planet. The book also addresses why we need to carry out these tasks and, more importantly, what a human crew could achieve that an automated mission could not. Understanding the clear benefits of sending a human crew to the surface of Mars, and how these benefits can be seen back on Earth, is the key to sustained long-term public and political support for the programme in terms of cash and commitment.

The book accepts that the journey will be made, but does not specify precisely when. Flight time, and how to get to and from the planet are discussed briefly, to understand why the suggested duration spent at Mars is reasonable.

The main objective of the work is to look at what science will be done on the surface a" supported by orbital operations a" and what hardware and technology will be employed to achieve the mission objectives. This analysis is drawn from previous experiences in manned and unmanned space programmes, including Apollo, Skylab, Salyut/Mir, Shuttle and ISS, Viking, Luna/Lunokhod, and recent Mars missions such as Pathfinder and Global Surveyor.

In addition, new interviews with key personalities involved in planning Martian exploration, and discussions about current thoughts on what we need to accomplish on Mars when we get there, will provide a lively and thought provoking account that could generate fresh debate.

When the decision is finally made to go to Mars, it will be made in the knowledge that most of the world knows why we aregoing and what benefits mankind will see for the effort. The authorsa (TM) primary objective is to begin this understanding.

Paolo Ulivi provides a well-paced, rapidly moving, balanced, even-handed account of lunar exploration as a popular history. He covers the unmanned programmes, e.g. Ranger, and other American probes in the late 50s and in the later chapters he looks at recent lunar exploration and future plans for the same. It 's a book that will be perfect for an enthusiast or someone coming to the story for the first time, as it does not include excessive technical depth. Uniquely drawing on recently declassified documents, detail of Chinese lunar exploration projects is provided, as well as nuclear lunar weapons of the 50s developed by the super powers, Soviet Russia and the United States.

What will be the next ‘giant leap’ in space exploration? Could it be a manned expedition to the Red Planet Mars? In this challenging and thought-provoking book, Martin Turner shows how modern technologies not only make such a journey possible, but that advances in those technologies will make it more probable, and that the first human mission to Mars will happen within our lifetime. The latest rocket propulsion, spacecraft technology and planned developments in nuclear and electric propulsion technologies are the key factors which will enable this journey to take place. Of particular importance is the necessity to transport cargo to Mars, and to provide essential life support for the crew food, water, air and fuel to enable the return journey. Expedition Mars challenges us to face the fact that, sooner or later, humans will have to make a choice: stay here on Earth or explore the Solar System beyond.

Most of the visible matter in the universe exists in the plasma state. Plasmas are of major importance for space physics, solar physics, and astrophysics. On Earth they are essential for magnetic controlled thermonuclear fusion.

This textbook collects lecture notes from a one-semester course taught at the K.U. Leuven to advanced undergraduate students in applied mathematics and physics. A particular strength of this book is that it provides a low threshold introduction to plasmas with an emphasis on first principles and fundamental concepts and properties.

The discussion of plasma models is to a large extent limited to Magnetohydrodynamics (MHD) with its merits and limitations clearly explained. MHD provides the students on their first encounter with plasmas, with a powerful plasma model that they can link to familiar classic fluid dynamics. The solar wind is studied as an example of hydrodynamics and MHD at work in solar physics and astrophysics.

How did Mercury get such an enormous iron core? Why is its tectonic framework so different from any other planet or satellite? What is its crystal composition? Why is the crust so depleted in iron when the interior is so rich in that element? What are the polar deposits? Where do the elements in the exosphere come from? Mercury is a planet shrouded in mystery. Only 45 percent of its surface has been seen in any detail, and that was from the Mariner 10 flyby in 1974. Yet what is known only makes the planet more fascinating. New Earth-based observations have shed light on surface and exosphere compositions, and re-evaluations of the Mariner 10 data, using modern image processing techniques, show evidence for volcanic flow fronts, pyroclastics and other volcanic phenomena not seen before. This ground-breaking book not only chronicles what has been discovered, but looks ahead to what has yet to emerge. An accompanying CD contains all the best Mariner 10 images, including the data for each image, photomosaics and maps.

David Levy brings these "ghostly apparitions" to life. With fascinating scenarios both real and imagined, he shows how comets have wreaked their special havoc on Earth and other planets. Beginning with ground zero as comets take form, we track the paths their icy, rocky masses take around our universe and investigate the enormous potential that future comets have to directly affect the way we live on this planet and what we might find as we travel to other planets.

In this extraordinary volume, David Levy shines his expert light on a subject that has long captivated our imaginations and fears, and demonstrates the need for our continued and rapt attention.

This book is a direct sequel to: B. Bcrtotri and P. Farinclla, "Physics of the Earth and the Solar System, Dynamics and Evolution. Space Navigation. Spa cc-Time Structure" (Kluwcr Academic Publishers, 1990). Nearly 15 years af tcr its publication it became evident that the volume was in need of a new edition to keep up with the outstanding progress and the changing perspectives in this field. David Vokrouhlicky agreed to collaborate on the project and be the third author. On March 25, 2000. after a tong illness and a heart transplant. Paolo Farinella passed away. We then decided that. rather than aiming at a second edition, it made more sense to rewrite the book anew. While its basic content and the structure of the chapters are the same, important new topics have been added, including the extrasolar planetary systems, transneptunian objects. accurate determination of reference frames and new space projects. Greater relevance has been given to scmiquantitarive discussions before intro ducing formal developments: many figures have been added and updated and several errors corrected. More emphasis has given to the solar system, whereas geophysical topics have been left at a less advanced level. To mark this change the slightly differ ent title "Physics of the Solar System" was chosen. We wish to dedicate this book to the memory of Paolo Farinella. an out standing scientist, an invaluable collaborator and a dear friend."