Customer Reviews

Beyond Pluto: Exploring the Outer Limits of the Solar System

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In school most of us were taught that the last planet in the solar system is Pluto and there is nothing beyond but the vast emptiness of space. That is, at least until we reach the next star system. However, as the author points out in his book, the latest astronomical findings of the past ten years clearly show that there are many small objects (minor planets) that orbit beyond Pluto, which are also part of our solar system.

The book opens with a chapter devoted to the initial theoretical studies, which attempted to prove the existence of these distant objects years before they could be observed. The next two chapters examine two edge-of-the-solar-system objects, the short-period comets and the Centaurs (small bodies which orbit near Uranus and Neptune). The book then moves on to the long years spend by many astronomers trying to observe one of these objects and then characterize its orbit. Of course, once one was found many others where then discovered. After these sections, the book covers the effort to characterize the physical parameters, such as diameter, albedo, chemical composition, etc., of these objects and how they are formed and reformed (due to collisions with neighboring bodies). The book concludes which a section on future exploration of these objects and a subtle plea from the author to rename the Kuiper Belt after the man who first postulated its existence.

In general, I found this book to be quite interesting, especially the sections on the astronomers who devoted years of their life trying to find these objects. I do feel that some non-technical people may find this book a little overwhelming due to several graphs and the use many technical terms.

This book is a summary of the (few) things we (think we) know about the objects that orbit beyond Neptune. The author gradually guides the reader through the science of these small icy objects, which existence was suspected almost 50 years before their actual discovery.

Introductory historical and theoretical chapters, covering the period from the discovery of Pluto and the next decades, are followed by more and more discoveries and scientific results, most of them not older than 10 years. From the first Centaurs to the extrasolar dust disks observations, every aspect is clearly explained, and ultimately provides a complete picture of this region of the solar system.

Throughout this chronology, the author explains the science as well as the way this science is actually done, up in the observatories in Hawaii, or in an university office, in front of a computer screen. It is a very honest tribute to the people (the author being one of them) that spend most of their time trying to set-up complex experiments, understand the cryptic data sent back by their high-tech instruments, and then write articles about things they are usually the first to analyze.

This book is short because not much is known yet. But it is fascinating because almost everything we know has been discovered in the last 10 years, and you can expect more in the very near future. In order to get the most of what we be published, this book is the place to start.

And for those, like me, who are interested in the far regions of the solar system, I would recommend this other book about the "King of the Kuiper Belt", Pluto, written by another specialist (Alan Stern): "Pluto and Charon". It's a good complement to this one.

How is the edge of the solar system look like? Before 1992, most people are not quite sure even the theoretical Kuiper Belt have been proposed, but it's still lack of observational evidence. This book is believed to be the only popular science book that is dedicated on the subject of the edge of solar system. However, reading this book would be a bit difficult for the people without solid astronomical background.

This book address the story of the search of Kuiper Belt Objects(KBOs). Published in 2001, the content is not up to date, as the discovery is everchanging, including the finding of 2003UB313, Eris, that led to the great planetary debate. However, this book put detail discussion on the steps and searches of early attempts and discoveries. Since 1992, the first KBO is discovered, but the story of KBO is seldom appeared on books, thus this is a very important book on the subject.

From Centaurs, work of astronomers, how astronomers search, analysis and follow-up, all these are outlined in the book. The orbital resonance with Neptune, color distribution of KBOs etc. are also included.

This is a great valued book for those who want to know more about the life of a small group of astronomers.

Television documentaries about astronomers tend to romanticize their work, making it look like a parade of exciting discoveries. This book, about the search for objects beyond the traditional nine planets, gives the reader a much more realistic picture. Davies describes how individual astronomers and small groups work through the laborious processes of searching, analyzing results, and testing theories. There are many obstacles, including scientific rivalries and limited access to observatories. Yet patient work has gradually revealed an enormous, previously undetected realm of icy planetoids, some of which are perturbed into the inner solar system to become comets.

Davies' writing is clear and straightforward, avoiding mathematics and explaining technical terms where necessary. Readers with a serious interest in astronomy will find this book fascinating. Readers whose interest is only marginal may find it too detailed and slow-moving. Though the black and white illustrations are useful, it would have helped to have diagrams showing the scale of this vast realm all the way out to the hypothetical Oort Cloud. Good examples can be found in the June 2004 issue of Sky and Telescope.

I bought this book to get information on the trans-Plutonian objects recently discovered. While there is some material on this (apparently little is actually known), most of the book is about the scientists who discovered these objects and how they did it. If you're looking for a book on how scientists work, this is quite good, but if like me you're looking for a book on the results of that work, you may be disappointed. I feel the title is a misnomer (though probably attention getting), because Pluto and its moon are among the objects discussed! Also, most of the objects orbit between Neptune and Pluto (at least when Pluto is at its average distance), so are really better described as trans-Neptunian than trans-Plutonian. I don't mean to be so negative about the book; it wasn't what I expected, based on the title, but it could be just what you're looking for.