Astrophysik

Indian astronomical texts give the coordinates of the yogataras or junction stars of nakshatras. These coordinates have been interpreted as polar coordinates, which depend on the position of the north celestial pole. Polar coordinates of a star should change with time due to precession. However, different astronomical texts written over many centuries give same coordinates for most yogataras. This has resulted in indian astronomers being called incompetent, who did not observe the positions of the stars with accuracy. Examples of such disciplines include:AstrophysicsGalactic astronomyGalaxy formationCosmologyAstrometryExtragalactic astronomyStellar astronomyFormation of starsAstronomy is the study of the space and all of its amazing moving parts. The study of space, in particular its stars and planets, has a long history, both of assisting farmers to know when it was time to plant and keeping sea faring travelers on the right longitude.

Rocket Age traces the history of spaceflight innovation from Robert Goddard’s early experiments with liquid fuel rockets, through World War II and the work of Wernher von Braun and his German engineers, on to the postwar improvements made by Sergei Korolev and his team in the Soviet Union, and culminating with the historic Moon walk made by Neil Armstrong and Buzz Aldrin on July 20, 1969.<BR><BR> From designers to engineers, and even communication specialists and the builders who assembled these towering rockets, hundreds of thousands of people worked on getting humans to the Moon, yet only a few have been recognized for their contributions. George D. Morgan sets the record straight by giving these forgotten figures of space travel their due.<BR><BR> The son of rocket scientists who worked directly on NASA projects Mercury, Gemini, and Apollo, Morgan gives behind-the-scenes details on the famous missions, including a rare interview with Dieter Huzel –Wernher von Braun’s right-hand man and a chief engineer on every major manned space program.<BR><BR> Even the most voracious readers of US space flight history will discover things in this book that they have never read before. Rocket Age shines a light on those that have for too long been left out of the picture of the race to land on the Moon.

This book provides a comprehensive review of the soft X-rays emitted when the solar wind interacts with exospheric neutrals at Venus, Mars, comets, the Moon, and Earth. It shows how observations can be used to address research problems ranging from the nature of magnetic reconnection at the Earth's magnetopause to atmospheric loss at other planets. The book provides the theoretical basis for soft X-ray emission and describes simulations of the expected emissions, past observations by narrow field-of-view X-ray telescopes, and current efforts to develop a new generation of wide field-of-view telescopes capable of capturing the entire solar wind-obstacle interaction.Originally published in Space Science Reviews, Volume 214, Issue 4, Article 79, 2018

Book is written to enlighten the human beings on the planet Earth about the truth that, in the beginning, before the formation of the universal things, it was only Infinite Space all over (logically). So, the creation must start from the Space itself. This is a philosophical book based on scientific reasoning, cause and effect. The infinite Space occupies 99.9999999% of every atom of both living and non-living things in the Universe. All the universe has been created by the Space, from the Space and of the Space energy. Space is the base and the cause for all these universal particles to generate from, to stay in, to grow and finally immerse in the Space when they become weak and die. All the things in the universe have been generated in the form of invisible and subtle energy particles and later grow up to a level of visible objects, composed with millions of particles of various elements, as is evident from our birth itself. Omnipotent Space, occupied in the human mind and body, is the cause for the feeling of self existence, life, consciousness and functioning of the whole parts of the body and mind. Without Space the human being becomes a lifeless doll. One's goal should be to realize and experience the Unity of Space within him (Inner Space) & all over the Universe (Infinite Space) - the Oneness of the Omnipotent Space.

How to Love the Universe is a new kind of science writing by an author truly enamored of the world around him. In ten short chapters of lyrical prose-each one an ode to a breathtaking realm of discovery-Stefan Klein uses everyday objects and events as a springboard to meditate on the beauty of the underlying science.Klein sees in a single rose the sublime interdependence of all life; a day of stormy weather points to the world's unpredictability; a marble conjures the birth of the cosmos. As he contemplates the deepest mysteries-the nature of reality, dark matter, humanity's place among the galaxies, and more-Klein encourages us to fall in love with the universe the way scientists do: with a grasp of the key ideas and theories of twenty-first-century physics that bring to life the wonders of, really, everything.You won't look at a rose-or at our world-the same way again.

This PhD thesis details the development of a new 1D ionospheric model to describe the upper atmospheres of extrasolar giant plants. The upper atmospheres of Hot Jupiters are subject to extreme radiation conditions that can result in rapid atmospheric escape. The composition and structure of these planets' upper atmospheres are affected by high-energy emissions from the host star. The nature of these emissions depends on the stellar type and age, making them important factors in understanding the behaviour of exoplanetary atmospheres. 

This volume contains five articles describing the mission and its instruments.  The first paper, by the project scientist Richard C. Elphic and his colleagues, describes the mission objectives, the launch vehicle, spacecraft and the mission itself.  This is followed by a description of LADEE's Neutral Mass Spectrometer by Paul Mahaffy and company.  This paper describes the investigation that directly targets the lunar exosphere, which can also be explored optically in the ultraviolet.  In the following article Anthony Colaprete describes LADEE's Ultraviolet and Visible Spectrometer that operated from 230 nm to 810 nm scanning the atmosphere just above the surface.  Not only is there atmosphere but there is also dust that putatively can be levitated above the surface, possibly by electric fields on the Moon's surface.  Mihaly Horanyi leads this investigation, called the Lunar Dust Experiment, aimed at understanding the purported observations of levitated dust.  This experiment was also very successful, but in this case their discovery was not the electrostatic levitation of dust, but that the dust was raised by meteoroid impacts.  This is not what had been expected but clearly is the explanation that best fits the data.  Originally published in Space Science Reviews, Volume 185, Issue 1-4, 2014.

Top ten Sunday Times Bestseller'Engaging, ambitious and creative' GuardianWhere are we? Are we alone? Who are we? Why are we here? What is our future?Human Universe tackles some of the greatest questions that humans have asked to try and understand the very nature of ourselves and the Universe in which we live.Through the endless leaps of human minds, it explores the extraordinary depth of our knowledge today and where our curiosity may lead us in the future. With groundbreaking insight it reveals how time, physics and chemistry came together to create a creature that can wonder at its own existence, blessed with an unquenchable thirst to discover not just where it came from, but how it can think, where it is going and if it is alone.Accompanies the acclaimed BBC TV series.

Pulsar timing is a promising method for detecting gravitational waves in the nano-Hertz band.In his prize winning Ph.D. thesis Rutger van Haasteren deals with how one takes thousands of seemingly random timing residuals which are measured by pulsar observers, and extracts information about the presence and character of the gravitational waves in the nano-Hertz band that are washing over our Galaxy. The author presents a sophisticated mathematical algorithm that deals with this issue. His algorithm is probably the most well-developed of those that are currently in use in the Pulsar Timing Array community. In chapter 3, the gravitational-wave memory effect is described. This is one of the first descriptions of this interesting effect in relation with pulsar timing, which may become observable in future Pulsar Timing Array projects. The last part of the work is dedicated to an effort to combine the European pulsar timing data sets in order to search for gravitational waves. This study has placed the most stringent limit to date on the intensity of gravitational waves that are produced by pairs of supermassive black holes dancing around each other in distant galaxies, as well as those that may be produced by vibrating cosmic strings. Rutger van Haasteren has won the 2011 GWIC Thesis Prize of the Gravitational Wave International Community for his innovative work in various directions of the search for gravitational waves by pulsar timing. The work is presented in this Ph.D. thesis.

An up-to-date presentation of the progress and current problems in the early universe, cosmic microwave background radiation, large scale structure formation, and the interplay between them. The emphasis is on the mutual impact of fundamental physics and cosmology, both at theoretical and experimental (observational) levels within a deep, well- focused and well-defined programme. The nature of the domain itself leads to different aspects, approaches and points of view on the same topic. Special care has been taken to provide the reader the basis of the different, sometimes competing lines of research. All contributions are uniformly excellent, with a careful selection of the subjects and approaches covered, presenting a unifying and rigorous view of the field. Audience: experimentalists and theoreticians from a variety of backgrounds: physics, astrophysics and astronomy. An excellent reference for post-doctoral scientists. Useful for senior scientists and advanced graduate students.

- Offers a unique combination of informative text, magnificent illustrations and stylish design - Examines the 100 most important discoveries since the invention of the telescope - Features spectacular photographs, taken with the largest telescopes on Earth and in space, that portray distant corners of the universe - Author Govert Schilling is a renowned astronomy journalist and science communicator In his Atlas of Astronomical Discoveries, astronomy journalist Govert Schilling tells the story of 400 years of telescopic astronomy. He looks at the 100 most important discoveries since the invention of the telescope. Doing what Schilling does best, he takes the reader on an adventure through both space and time. Photographs and amazing pictures line the pages of this book, offering the reader an escape from this world and an invitation to a world far beyond what the unaided human eye can detect.

In the grand tradition of the scholar-adventurer, acclaimed author Richard Cohen takes us around the world to illuminate our relationship with the star that gives us life. Drawing on more than seven years of research, he reports from locations in eighteen different countries. As he soon discovers, the Sun is present everywhere—in mythology, language, religion, politics, sciences, art, literature, and medicine, even in the ocean’s depths. For some ancient worshippers, our star was a man abandoned by his spouse because his brightness made her weary. The early Christians appropriated the Sun’s imagery, with the cross becoming an emblem of the star and its rays, and the halo a variation of that. Einstein helped replicate the Sun’s power to create the atomic bomb, while Richard Wagner had Tristan inveigh against daylight as the enemy of romantic love. In this splendidly illustrated volume packed with captivating facts, extraordinary myths, and surprising anecdotes, Cohen not only explains the star that so inspires us, but shows how multifacted our relationship with it has been—and continues to be.

An outgrowth of the first Asia-Pacific Regional School on the International Heliophysical Year (IHY), this volume contains a collection of review articles describing the universal physical processes in the heliospace influenced by solar electromagnetic and mass emissions. The Sun affects the heliosphere in the short term (space weather) and in the long term (space climate) through numerous physical processes that exhibit similarities in various spatial domains of the heliosphere. The articles take into account various aspects of the Sun-heliosphere connection under a systems approach.This volume will serve as a ready reference work for research in the emerging field of heliophysics, which describes the physical processes taking place in the physical space controlled by the Sun out to the local interstellar medium.

The last years have seen a symbiosis of the fields of elementary particle physics and the astrophysics of the early universe. This text presents the background of the subjects and the latest developments at a level suitable for final year undergraduates and beginning graduate students. The first chapters cover the properties and interactions of elementary particles followed by discussion of the early universe, including inflation, dark matter and dark energy, and the growth of the galactic structure. The final chapters discuss cosmic rays and particle physics in the stars. The close relation between particle interactions and large scale development of the cosmos is a constant theme in the text, with emphasis on the interplay between experiment and theory. This book is an enlarged and updated version of the first edition published five years ago. In a rapidly evolving field, emphasis has of course been placed on the most recent developments. However, the opportunity has also been taken to re-arrange the material and present it in more detail and at somewhat greater length.

Will we ever discover a single scientific theory that tells us everything that has happened, and everything that will happen, on every level in the Universe? The quest for the theory of everything - a single key that unlocks all the secrets of the Universe - is no longer a pipe-dream, but the focus of some of our most exciting research about the structure of the cosmos. But what might such a theory look like? What would it mean? And how close are we to getting there?In New Theories of Everything, John D. Barrow describes the ideas and controversies surrounding the ultimate explanation. Updating his earlier work Theories of Everything with the very latest theories and predictions, he tells of the M-theory of superstrings and multiverses, of speculations about the world as a computer program, and of new ideas of computation and complexity. But this is not solely a book about modern ideas in physics - Barrow also considers and reflects on the philosophical and cultural consequences of those ideas, and their implications for our own existence in the world.Far from there being a single theory uniquely specifying the constants and forces of nature, the picture today is of a vast landscape of different logically possible laws and constants in many dimensions, of which our own world is but a shadow: a tiny facet of a higher dimensional reality. But this is not to say we should give up in bewilderment: Barrow shows how many rich and illuminating theories and questions arise, and what this may mean for our understanding of our own place in the cosmos.

This book introduces new research topics in earthquake engineering through the application of computational mechanics and computer science. The topics covered discuss the evaluation of earthquake hazards such as strong ground motion and faulting through applying advanced numerical analysis methods, useful for estimating earthquake disasters.These methods, based on recent progress in solid continuum mechanics and computational mechanics, are summarized comprehensively for graduate students and researchers in earthquake engineering. The coverage includes stochastic modeling as well as several advanced computational earthquake engineering topics.

Many astrophysical bodies produce winds, jets or explosions, which blow spectacular bubbles. From a nonmathematical, unifying perspective, based on the understanding of bubbles, the authors address many of the most exciting topics in modern astrophysics including supernovae, the production of structure in the Early Universe, the environments of supermassive black holes and gamma-ray bursts.

"l hope that people all around the world never forget what a wonderful thing it is to lie on your back and look up at the stars" Pete Seeger What is the fascination that constellations hold for people? There are probably as many different answers to that question as there are people. For many, though, the constella­ tions are the stepping-off point into the fabulous, mind-bending discoveries and concepts of modern astronomy. For others it is their long and intriguing history that beckons. For some people the constellations provide the means for navigation and orientation over the surface of the Earth, and of course there are the millions who place some faith in horo­ scopes. But for most people the patterns in the sky are a beautiful part of their environ­ ment to be treasured alongside the forests, fields and rivers that make life worth living. However just as we are losing our green environment to pollution, so we are losing our sky. The glow from cities across the world swamps the stars in the night sky. Astronomers have had to retreat to remote mountain tops to escape that light pollution. The rest of us must make do with what is available. From the centre of a city, or any other brightly lit area, probably no stars at all will be visible even on the clearest of nights. From the suburbs, the brighter stars should normally be seen.

Der zweite Band der Betriebswirtschaftslehre im Grundstudium befaßt sich mit dem betrieblichen Rechnungswesen. Er führt im ersten Teil knapp in das System der doppelten Buchführung ein und behandelt im zweiten Teil die Kostenrechnung. Neben der Technik der Kostenrechnung wird die Teil- und Plankostenrechnung dargestellt sowie auf neuere Entwicklungen eingegangen. Themen des dritten Teils sind der Jahresabschluß, die Rechnungslegung im Konzern und die Verfahren der Bilanzanalyse. In der didaktisch geschickten Aufbereitung des Lehrstoffs spiegelt sich die langjährige Lehrerfahrung der Autoren im Grundstudium.