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Most astronomers and physicists now believe that the matter content of the Universe is dominated by dark matter: hypothetical particles which interact with normal matter primarily through the force of gravity. Though invisible to current direct detection methods, dark matter can explain a variety of astronomical observations. This book describes how this theory has developed over the past 75 years, and why it is now a central feature of extragalactic astronomy and cosmology. Current attempts to directly detect dark matter locally are discussed, together with the implications for particle physics. The author comments on the sociology of these developments, demonstrating how and why scientists work and interact. Modified Newtonian Dynamics (MOND), the leading alternative to this theory, is also presented. This fascinating overview will interest cosmologists, astronomers and particle physicists. Mathematics is kept to a minimum, so the book can be understood by non-specialists.
An insider's view of how the massive black hole was discovered at the Galactic Center.
A critical assessment of the standard cosmological model and its main challenger, modified Newtonian dynamics (MOND).
Since the beginning of the century, there have been calls for the integration of traditional individualistic (micro) and management (macro) paradigms in Human Resource Management studies. In order to understand this so-called ’black box,’ the HR field needs research which is more sensitive to institutional and cultural contexts, focusing on formal and informal relationships between employees, supervisors and HR managers and the means by which these organizational participants enable and motivate one another. This book presents advanced quantitative and mixed research methods that can be used to analyze integrated macro and micro paradigms within the field of Human Resource Management. Multi actor, social network and longitudinal research practices, among others, are explored. Readers will gain insight into the advantages and disadvantages of different research methods in order to evaluate which type is most suitable to their research. This book is suitable for both advanced researchers and graduate students.
Fittingly named for a wild horse, this fighter became widely recognized for its power and beauty. It was a key element in Allied air superiority in Europe during WWII, destroying 9,081 enemy aircraft, and with similar results in the Korean War. Striking photos and the personal stories of the men who flew it help to tell the story of this superior aircraft. Full color photos of restored P-51s. Revised and updated
The inspiring national bestseller from the U. S. Senator and leading Democratic candidate for president—about the fierce fight for democracy and social justice, and what we need to do next. In Where We Go from Here, New York Times bestselling author Bernie Sanders reveals the blueprint for his 2020 presidential run by chronicling the day-by-day struggles that he and his progressive colleagues have waged over the last two years in the fight against Donald Trump's reactionary agenda and for a government that works for all, not just wealthy campaign contributors. At home, Sanders has helped lead the fight for Medicare for all, fought for workers desperate for higher wages, and supported immig...
First published in Great Britain in 2013.