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IAU Symposium 263 provides a state-of-the-art review of icy bodies in the Solar System, a topic that is crucial to understanding processes involved in the Solar System's formation, the consequences for water on planets, and the habitable zones around other stars.

These Transactions complete the series of volumes covering the XXVII General Assembly of the International Astronomical Union. They provide a record of the admission of new members, the Resolutions passed, and an account of the regular Business Meetings of the Executive Committee, the Divisions, Commissions and Working Groups.

This volume records the proceedings of the IAU XXVII General Assembly and is a testament to the vigour and momentum of astrophysical discovery in 2009, the International Year of Astronomy. Covering planets, stars, galaxies, dark matter and modern cosmology, it provides a broad overview of modern astrophysics.

IAU S248 reflects the state-of-the-art in the field of astrometry. In showing the latest achievements in ground-based astrometry and the progress of second-generation astrometric satellites, this volume demonstrates the ever growing role played by astrometry in understanding the Universe.

IAU S240 highlights the latest advances in the field and brings together members of the 'wide' and 'close' binary communities. Topics discussed explore the numerous interests common to all binary star researchers. This volume will be an important reference source for binary star researchers for many years to come.

IAU S243 reviews recent developments in understanding the structure and evolution of the star-disk interaction region in young stars. The latest observational results, computer simulations and theoretical developments are included, providing a unique review of this topic that is ideal for graduate students and researchers.

Once considered objects of dubious existence, recent observations have provided overwhelming evidence in favour the presence of black holes. IAU S238 brought together observers and theoreticians working in black hole astrophysics to highlight and discuss similarities in the physics involved, review the subject, and report on recent results.

IAU Symposium 312 brings together experts on high resolution observations, theoretical modelling and computational simulations, who present their research on star clusters, black holes and their interrelations, and gravitational wave astrophysics. This volume allows graduate students and researchers to access the current state of these fields.

New stars form in the dense turbulent gas clouds of galaxies, and the formation of these clouds is the subject of the IAU S237. This book is the most up-to-date review of all aspects of cloud and star formation, and one of the few compendiums available on ISM turbulence.

Near Earth Objects (NEOs) are an essential tool to understand the overall populations of asteroids and comets, to constrain the formation of the planetary system. This volume, IAU S236, concentrates on the specific techniques of observation and modeling which are effective for NEOs.

This volume addresses astronomy education and research in developing countries. It presents the state of astronomy education and research, and public outreach in major developing regions of the world. This volume will be useful resource for astronomers interested in promoting and supporting astronomy and space science around the world.

IAU S249 presents the latest theoretical and observational advances in exoplanet research. The volume reviews exoplanet detection and orbital determination techniques, the physics of planetary atmospheres, planet formation, migration and the dynamical evolution of protoplanetary disks. A useful reference for all research groups working in this exciting field.

Dense stellar systems lie at the interface between dynamics, stellar evolution and galaxy formation and are an ideal laboratory to understand different aspects of these fields and to explore the interplay between them. IAU S246 provides a complete review of dense stellar systems with emphasis on comparing observations and simulations.

Planetary nebulae represent the brief transition between AGB stars and white dwarfs. They have played a key role in developing our understanding of atomic, molecular, dust and plasma processes in astrophysical environments. IAU S234 summarises current research on planetary nebulae, as reported in reviews by leading experts in the field.

Dwarf galaxies offer a valuable insight into the physical processes that govern galaxy formation and evolution at high redshift. These elusive stellar systems are helping astronomers to find answers to some of the most burning questions in extragalactic astronomy. These proceedings offer an exciting multidisciplinary collection of recent esearch results.

This volume reviews recent research in the field of quasar absorption line systems, from both observational and theoretical perspectives. Chapters cover topics from the galaxy-absorber connection, Lyman-alpha systems, abundances and dust, to models and numerical simulations concerning many of these aspects. A valuable resource for graduate students and professional astronomers.

Cosmic masers provide important tools to investigate galactic structure and environments. This volume contains the latest research on masers, as presented at IAU Symposium 287, providing a comprehensive and up-to-date review of their nature, sources, environments and uses.

IAU Symposium 270 reviews the latest techniques and results of numerical simulations relevant to interstellar gas dynamics and star formation. Topics range from dynamics to radiation and visualization, as applied to both local and cosmological problems. This book is ideal for graduate students and researchers in numerical astrophysics.