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.

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.

Neuroblastoma is a cancer that develops from nerve cells found in several areas of the body. Neuroblastoma most commonly affects children age 5 or younger, though it may rarely occur in older children and adults. Neuroblastoma is the most common cancer in babies. Neuroblastoma develops in tissue that makes up the sympathetic nervous system -- the system of nerves that automatically regulates your heart rate, blood pressure and digestion. Neuroblastoma most commonly arises in and around the adrenal glands, which sit atop the kidneys. However, Neuroblastoma can also develop in other areas of the abdomen and in the chest, neck and pelvis. This book presents important research in this field of research.

IAU Symposium 263 provides a state-of-the-art review of icy bodies in the Solar System, a topic crucial to understanding processes involved in the Solar System's formation, the consequences for water on planets, and ultimately, the habitable zones around other stars. Ice-rich planetesimals which form beyond the snow line are discussed, using an interdisciplinary approach. The main topics covered include: accretion of icy grains in the protoplanetary disk, the long-period comet flux and the Oort cloud population, transfer mechanisms of bodies from their source regions to the Sun's neighborhood, the physics and dynamics of trans-Neptunian objects, transition objects (comets and asteroids), cryovolcanism and modeling the interiors of icy bodies, and a review of past, present and future space missions. This volume gives a broad overview of the importance of these bodies, from comets up to liquid water on terrestrial planets, and the formation of ices in the Solar System.