Le mystère des ummites : Une science venue d'une autre planète ?

Jean-Pierre Petit, astrophysicien, directeur de recherche, spécialiste de cosmologie théorique et de propulsion électromagnétique " MHD ", reçoit, ainsi que d'autres humains, d'étranges courriers émanant des Ummites qui se prétendent extraterrestres. S'agit-il d'un canular ou d'un authentique contact avec des visiteurs venus d'une autre planète ? L'auteur affirme que seuls des scientifiques très en pointe pourraient envoyer ces infor...

Découvrir l'astronomie : observer le ciel, choisir son matériel, débuter en astrophotographie

Ce guide pratique donne toutes les bases pour découvrir et pratiquer l'astronomie d'amateur, en dressant un panorama complet de la discipline. Il s'adresse aussi bien au débutant qui désire faire ses premiers pas en astronomie, qu'à l'amateur éclairé qui souhaite approfondir ses connaissances. Trois thèmes principaux : ¤ Observer le ciel Tous les conseils nécessaires pour observer le ciel à l'oeil nu, aux jumelles ou au moyen d'une l...

Manifestations of Dark Matter and Variations of the Fundamental Constants in Atoms and Astrophysical Phenomena

This thesis explores the possibility of searching for new effects of dark matter that are linear in g, an approach that offers enormous advantages over conventional schemes, since the interaction constant g is very small, g<<1. Further, the thesis employs an investigation of linear effects to derive new limits on certain interactions of dark matter with ordinary matter that improve on previous limits by up to 15 orders of magni...

Keine Gesellschaft ohne Wissenschaft!

Dieses Buch zeigt, welche wichtige Rolle die Naturwissenschaft in der Gesellschaft und bei der Gestaltung unserer Umwelt hat und diskutiert die daraus resultierende Verantwortung der Wissenschaftler in Bezug auf die Entwicklung der Welt. Im Rahmen einer Analyse des Verhältnisses von Wissenschaft und Politik gibt das Buch Hinweise, wie Wissenschaftler ihre Erkenntnisse in den politischen Entscheidungsprozess einbringen können (und sog...

Star Ware: The Amateur Astronomer's Guide to Choosing, Buying, and Using Telescopes and Accessories

Praise for Star Ware "Star Ware is still a tour de force that any experienced amateur will find invaluable, and which hardware–minded beginners will thoroughly enjoy." – Robert Burnham, Sky & Telescope magazine "Star Ware condenses between two covers what would normally take a telescope buyer many months to accumulate." – John Shibley, Astronomy magazine Whether you′re shopping for your first telescope or your fifth, don′t be surpris...


Comet begins with a breathtaking journey through space astride a comet. Pulitzer Prize-winning astronomer Carl Sagan, author of Cosmos and Contact, and writer Ann Druyan explore the origin, nature, and future of comets, and the exotic myths and portents attached to them. The authors show how comets have spurred some of the great discoveries in the history of science and raise intriguing questions about these brilliant visitors from t...

An Introduction to Radio Astronomy, 3rd Edition

Written by two prominent figures in radio astronomy, this well-established, graduate-level textbook is a thorough and up-to-date introduction to radio telescopes and techniques. It is an invaluable overview for students and researchers turning to radio astronomy for the first time. The first half of the book describes how radio telescopes work - from basic antennas and single aperture dishes through to full aperture-synthesis arrays....

A Question and Answer Guide to Astronomy

Are we alone in the Universe? Was there anything before the Big Bang? Are there other universes? What are sunspots? What is a shooting star? Was there ever life on Mars? This book answers the fascinating questions that we have been asking ourselves for hundreds of years. Using non-technical language, the authors summarize current astronomical knowledge, taking care to include the important underlying scientific principles. Plentiful ...

What Goes Up... Gravity and Scientific Method

The concept of gravity provides a natural phenomenon that is simultaneously obvious and obscure; we all know what it is, but rarely question why it is. The simple observation that 'what goes up must come down' contrasts starkly with our current scientific explanation of gravity, which involves challenging and sometimes counterintuitive concepts. With such extremes between the plain and the perplexing, gravity forces a sharp focus on ...

Spatial Big Data Science: Classification Techniques for Earth Observation Imagery

Emerging Spatial Big Data (SBD) has transformative potential in solving many grand societal challenges such as water resource management, food security, disaster response, and transportation. However, significant computational challenges exist in analyzing SBD due to the unique spatial characteristics including spatial autocorrelation, anisotropy, heterogeneity, multiple scales and resolutions which is illustrated in this book. This ...