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Good Reads  Reference  Physical Sciences  Cosmology & Astronomy

Twenty Worlds The Extraordinary Story of Planets Around Other Stars

Popular Science
By: Niall Deacon(Author)
208 pages, 27 colour & 4 b/w illustrations
Publisher: Reaktion Books
Twenty Worlds
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  • Twenty Worlds ISBN: 9781789143386 Hardback Aug 2020 Not in stock: Usually dispatched within 6 days
Price: £15.95
About this book Contents Customer reviews Biography Related titles

About this book

Thirty years ago the only planets we knew were the ones orbiting our own Sun; we now know of thousands of other worlds orbiting distant stars. In Twenty Worlds astronomer Niall Deacon journeys to twenty of these globes: from giant, blisteringly hot planets orbiting close to their parent stars to planets that float through the cold wilderness of space alone, and from dead stars shredding asteroids to worlds made of diamond and even planets that may be similar to the Earth. Deacon also takes in the latest exoplanet discoveries and explains how astronomers have come to learn so much about these strange and distant worlds.

Twenty Worlds tells a sweeping story, of real planets around other stars, and appeals to the wide audience for popular science and astronomy.


Introduction: An Ordered Family Portrait

Alien Worlds
1 A World beyond Expectation
2 A World Obscuring
3 A Tempestuous World
4 A Glimmer of Atmosphere
5 A World in Reverse

Towards Earth
6 A Flash from Darkness
7 A World You Can’t Set Your Watch By
8 A Contrasting Sibling
9 A World Like Ours?

10 An Unseen Embryo
11 A World through the Blur
12 An Ember Spat from a Fire
13 A Lonely Planet
14 A Dreich World?

15 A Cursed World
16 A World that’s Just Right?
17 A World Bombarded

18 A Dark Cloak of Death
19 A World Torn Asunder
20 A Diamond Born from Death

Epilogue: Yet More Worlds

Appendix: The Twenty Worlds
Photo Acknowledgements

Customer Reviews


Niall Deacon is an astronomy researcher and writer and lives in Heidelberg, Germany. His research focuses on failed stars called brown dwarfs and giant planets orbiting other stars.

Popular Science
By: Niall Deacon(Author)
208 pages, 27 colour & 4 b/w illustrations
Publisher: Reaktion Books
Media reviews

"this is the perfect book to introduce exoplanet science [...] But Twenty Worlds is not really for those who want to find out more about any one of the planets covered. Rather it reveals what each of them represents to the field in general. Its real value is in the analogies that Deacon uses to clarify difficult and complex exoplanetary scientific methods to the reader. Nowhere will you find a more descriptive book to understand the processes used to learn about the existence of these worlds."
BBC Sky at Night Magazine

"With thousands of exoplanets currently known, it must be a daunting task to choose twenty of them to highlight. Yet, that is exactly what Niall Deacon sets out to do. The book, rather than presenting a cornucopia of bizarre exoplanets (and there are many of them out there), uses a curated sample of 20 exoplanets to tell a story about how these systems are detected, studied and what they can tell us about the birth, evolution and even death of planets, as well as their interaction with their host stars. The sheer diversity of the exoplanets detected poses a fascinating challenge to planet-formation theorists and exoplanet observers alike."
Nature Astronomy

"this is an attractive, well-produced book providing much information about new and exciting discoveries being achieved by good old-fashioned astronomical methods, albeit highly sophisticated. It is refreshingly free from the dilemmas existing in other areas of cosmology – wave/particle duality, string theory, multiverses, et cetera – and I recommend it as well worth
reading by any interested layman (who doesn't feel too strongly about Pluto)."
The Observatory Magazine

"With Niall Deacon's book we not only see that there are a multitude of worlds out there, but the variety and conditions in which they were born are as strange as we could hope to imagine. They all have individual characteristics, some similar to our own family, others bizarrely different. His choice of worlds, I feel, has been carefully done, to show the known variety in the family of discovered planets [...] Niall's style of writing is easy to follow and keeps the reader interested throughout [...] The book was very enjoyable to read and the 200 pages kept the reader wanting more, I genuinely felt I was both entertained and informed."
Physics Education

"This is a truly entertaining and informative book, but the reason I'm giving it the full five stars has as much to do with the refreshing novelty of the author's style as anything else. There's novelty in the subject-matter too – the wide variety of recently discovered exoplanets orbiting other stars [...] He's a professional astronomer too, though you wouldn't guess that from his writing style, which is as straightforward and lucid as science writing gets."

"Twenty Worlds describes planets beyond our solar system. Though long imagined in science fiction novels and films, these 'exoplanets' have only been discovered since the 1990s. Author Deacon, an expert on this topic affiliated at the Max Planck Institute for Astronomy in Heidelberg, writes in a conversational manner that is far different from the stiff exposition of a science textbook. Yet he conveys as much about how astronomers deduce the physical and chemical properties of exoplanets as he does about the planets themselves. While thousands of exoplanets are now known, Deacon's text comprises only 20 short chapters, each devoted to a single planet, or to a solar system of planets orbiting around their own sun. These are not necessarily the most interesting or unusual planets, but each one is exploited to introduce one method or another by which researchers have deduced the nature of objects of its type, such as their size, mass, and orbit, or whether they are rocky, gaseous, atmosphere-bearing, aqueous, possibly habitable, or even perhaps composed of diamond. The reader who sets out to enjoy a popular account may end up with a serious understanding [...] of these alien worlds. Recommended."

"A wonderfully enjoyable tour of twenty diverse worlds that orbit distant stars. Niall Deacon uses simple ideas from science to show us how each world has its own personality – its own story. Twenty Worlds is an accessible introduction to some of the most exciting discoveries in astronomy."
– Michael E. Summers, Professor of Planetary Sciences and Astronomy, George Mason University

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