The accounts given by extraterrestrials in this volume are about events that occurred in our solar system many millions of years ago. In that ancient time the solar system consisted of four planets and four "radiar systems" that orbited the central sun. The four planets of the solar system are known today as Venus, Earth, Mars and a now-totally shattered world that was called Maldec. The term "radiar" applies to the astronomical bodies we presently call Jupiter, Saturn, Uranus and Neptune. The original satellites of these radiars are generally called moons by Earth astronomers, but the extraterrestrials prefer to call them planetoids. This book reflects the personal views of a number of different types of extraterrestrials regarding the state of the local solar system and the state of the Earth.

How did the universe begin? Where do galaxies come from? Where do the material particles we are made of come from? Today we have only provisional answers to such questions, but this will improve dramatically over the next ten years, predicts astronomer Gribbin. He focuses on what we think we know about ten issues and explains how cutting-edge research may yield solutions in the very near future. He explores ideas concerning the creation of the universe, the possibility of other forms of life, and the fate of the expanding cosmos. He examines "theories of everything," including grand unified theories and string theory, and he discusses the Big Bang theory, the origin of structure and patterns of matter in the galaxies, dark mass and dark energy, the future of Earth and the Sun, and the possibility that the universe might expand forever.--From publisher description.

Erwin Schrödinger's book What is Life? had a tremendous influence on the development of molecular biology, stimulating scientists such as Watson and Crick to explore the physical basis of life. Much of the appeal of Schrödinger's book lay in its approach to the central problems in biology - heredity and how organisms use energy to maintain order - from a physicist's perspective. At Trinity College, Dublin a number of outstanding scientists from a range of disciplines gathered to celebrate the fiftieth anniversary of What is Life? and following Schrödinger's example fifty years previously, presented their views on the current central problems in biology. The contributors to this volume include Stephen Jay Gould, Roger Penrose, Jared Diamond, Manfred Eigen, John Maynard Smith, Christien de Duve and Lewis Wolpert. This collection is essential reading for anyone interested in biology and its future.

Fifty years ago, the National Academy of Engineering (NAE) was founded by the stroke of a pen when the National Academy of Sciences Council approved the NAE's articles of organization. Making a World of Difference commemorates the NAE anniversary with a collection of essays that highlight the prodigious changes in people's lives that have been created by engineering over the past half century and consider how the future will be similarly shaped. Over the past 50 years, engineering has transformed our lives literally every day, and it will continue to do so going forward, utilizing new capabilities, creating new applications, and providing ever-expanding services to people. The essays of Making a World of Difference discuss the seamless integration of engineering into both our society and our daily lives, and present a vision of what engineering may deliver in the next half century.

Sixty leading luminaries, including scientists, writers, artists, religious leaders, businesspeople, and politicians, offer their thoughts on what life will look like by the middle of the twenty-first century.

Fifty years after the founding of NASA, from 28 to 29 October 2008, the NASA History Division convened a conference whose purpose was a scholarly analysis of NASA's first 50 years. Over two days at NASA Headquarters, historians and policy analysts discussed NASA's role in aeronautics, human spaceflight, exploration, space science, life science, and Earth science, as well as crosscutting themes ranging from space access to international relations in space and NASA's interaction with the public. The speakers were asked to keep in mind the following questions: What are the lessons learned from the first 50 years? What is NASA's role in American culture and in the history of exploration and discovery? What if there had never been a NASA? Based on the past, does NASA have a future? The results of those papers, elaborated and fully referenced, are found in this 50th anniversary volume. The reader will find here, instantiated in the complex institution that is NASA, echoes of perennial themes elaborated in an earlier volume, Critical Issues in the History of Spaceflight. The conference culminated a year of celebrations, beginning with an October 2007 conference celebrating the 50th anniversary of the Space Age and including a lecture series, future forums, publications, a large presence at the Smithsonian Folklife Festival, and numerous activities at NASA's 10 Centers and venues around the country. It took place as the Apollo 40th anniversaries began, ironically still the most famous of NASA's achievements, even in the era of the Space Shuttle, International Space Station (ISS), and spacecraft like the Mars Exploration Rovers (MERs) and the Hubble Space Telescope. And it took place as NASA found itself at a major crossroads, for the first time in three decades transitioning, under Administrator Michael Griffin, from the Space Shuttle to a new Ares launch vehicle and Orion crew vehicle capable of returning humans to the Moon and proceeding to Mars in a program known as Constellation. The Space Shuttle, NASA's launch system since 1981, was scheduled to wind down in 2010, freeing up funds for the new Ares launch vehicle. But the latter, even if it moved forward at all deliberate speed, would not be ready until 2015, leaving the unsettling possibility that for at least five years the United States would be forced to use the Russian Soyuz launch vehicle and spacecraft as the sole access to the ISS in which the United States was the major partner. The presidential elections a week after the conference presaged an imminent presidential transition, from the Republican administration of George W. Bush to (as it turned out) the Democratic presidency of Barack Obama, with all the uncertainties that such transitions imply for government programs. The uncertainties for NASA were even greater, as Michael Griffin departed with the outgoing administration and as the world found itself in an unprecedented global economic downturn, with the benefits of national space programs questioned more than ever before. There was no doubt that 50 years of the Space Age had altered humanity in numerous ways ranging from applications satellites to philosophical world views. Throughout its 50 years, NASA has been fortunate to have a strong sense of history and a robust, independent, and objective history program to document its achievements and analyze its activities. Among its flagship publications are Exploring the Unknown: Selected Documents in the History of the U.S. Civil Space Program, of which seven of eight projected volumes were completed at the time of the 50th anniversary. The reader can do no better than to turn to these volumes for an introduction to NASA history as seen through its primary documents. The list of NASA publications at the end of this volume is also a testimony to the tremendous amount of historical research that the NASA History Division has sponsored over the last 50 years, of which this is the latest volume.