Stellar cluster research is in a dynamic state. IAU Symposium 351 (also chosen as MODEST-19, within the 'Modelling and Observing DEnse STellar systems' meeting series) is a compilation of the research presented at the Symposium. It contains highlights of the latest research taking place in many areas, including the formation of stellar clusters at high redshifts, multiple stellar populations within stellar clusters, the dynamical evolution of stellar clusters, and the production of exotic objects such as black holes within stellar clusters. This volume also includes articles on the build up of larger galaxies from smaller galaxies and stellar clusters, and discussions of the latest data from large surveys and from the Gaia satellite. Looking at both the local and the high-redshift universe allows links to be established between the clusters we see today and their progenitors. IAU S351 is an ideal entry point for astronomers new to this research field.

Dieser Buchtitel ist Teil des Digitalisierungsprojekts Springer Book Archives mit Publikationen, die seit den Anfangen des Verlags von 1842 erschienen sind. Der Verlag stellt mit diesem Archiv Quellen fur die historische wie auch die disziplingeschichtliche Forschung zur Verfugung, die jeweils im historischen Kontext betrachtet werden mussen. Dieser Titel erschien in der Zeit vor 1945 und wird daher in seiner zeittypischen politisch-ideologischen Ausrichtung vom Verlag nicht beworben.

Die hier vorliegenden Ausfuhrungen uber unser heutiges Wissen von Sternhaufen werden in mancher Hinsicht unvollstandig erscheinen. Ich meine dabei namentlich das Kapitel uber Dichtegesetze von Stern haufen, welche keine Kugelsymmetrie zeigen und weiterhin die Aus fuhrungen uber die kosmogonische Stellung der Sternhaufen. Der Grund fur die Unvollstandigkeit ist vor allem im Mangel an ausreichendem Beobachtungsmaterial zu erblicken. Da die Ausfullung dieser Lucke aber nur eine Frage der Zeit sein durfte, scheint es gerechtfertigt, die Arbeitsmethoden selbst zu skizzieren und ihre Anwendung auf konkrete Falle spateren Untersuchungen zu uberlassen. Der Hauptwert wurde darauf gelegt, die bisherigen Arbeiten moglichst abschliessend zu be handeln, so weit das heute schon moglich ist. Ich mochte hier ganz besonders Herrn Professor Ki e nIe fur viele wert volle Ratschlage bei allen meinen Arbeiten uber Sternhaufen danken. Auf seine Anregung hin ist im Jahre 1923 der Grundstock dieses Buches in Gestalt meiner Dissertation entstanden. Insbesonders bin ich Herrn Professor Kienle zu grossem Dank verpflichtet fur die viele Muhe, die er wegen meiner Abreise nach Lembang mit der endgultigen Fertigstellung des Buches gehabt hat. Herr Geheimrat Wolf stellte die schonen Sternhaufenaufnahmen zur Verfugung, Herr cand. astr. Sieden topf fertigte das Register an. Die Verlagsbuchhandlung Julius Springer kam allen meinen Wunschen bezuglich Ausstattung des Buches und Beschleunigung der Drucklegung in der freundlichsten Weise entgegen. Ihnen allen sei an dieser Stelle der Dank des Verfassers ausgesprochen."

Popular culture is flourishing again, with a renewed interest in the ET and UFO phenomena. We are inundated with films, TV programmes and books, plus many conspiracy theories, dealing with the phenomena. Governments and security agencies are denying any interest in the issue, yet releasing masses of documents (mostly unreadable) after being compelled to, by the Freedom of Information Act. Such speculation and documentation in ancient writings suggests that an unearthly presence has been in Earth-space for many generations. The question of this situation must reach a culminating point sometime in the near future. This book is concerned with the cultural shock and social disorientation that would obviously occur with a sudden appearance en-mass of an alien race finally revealing themselves to humanity and how the people of Earth would react.

This book explores the great ontological question, namely, what is the meaning of life. And it's in two parts. The first part looks at psychological, philosophical, sociological and spiritual theories, which includes witchcraft. This sets the stage for part two, which addresses religion, politics, prophecy, aliens/UFOs, and scientific explanations for our existence. The mind is the common thread that links the chapters. Fundamentally, we're on the brink of a New World Order that's been orchestrated by Satan and for Satan. He's on his sordid way. Thus, it bodes well to be prepared for the coming great deception.

Gravity is one of the four fundamental interactions that exist in nature. It also has the distinction of being the oldest, weakest, and most difficult force to quantize. Understanding gravity is not only essential for understanding the motion of objects on Earth, but also the motion of all celestial objects, and even the expansion of the Universe itself. It was the study of gravity that led Einstein to his profound realisations about the nature of space and time. Gravity is not only universal, it is also essential for understanding the behaviour of the Universe, and all astrophysical bodies within it. In this Very Short Introduction Timothy Clifton looks at the development of our understanding of gravity since the early observations of Kepler and Newtonian theory. He discusses Einstein's theory of gravity, which now supplants Newton's, showing how it allows us to understand why the frequency of light changes as it passes through a gravitational field, why GPS satellites need their clocks corrected as they orbit the Earth, and why the orbits of distant neutron stars speed up. Today, almost 100 years after Einstein published his theory of gravity, we have even detected the waves of gravitational radiation that he predicted. Clifton concludes by considering the testing and application of general relativity in astrophysics and cosmology, and looks at dark energy and efforts such as string theory to combine gravity with quantum mechanics. ABOUT THE SERIES: The Very Short Introductions series from Oxford University Press contains hundreds of titles in almost every subject area. These pocket-sized books are the perfect way to get ahead in a new subject quickly. Our expert authors combine facts, analysis, perspective, new ideas, and enthusiasm to make interesting and challenging topics highly readable.