This book journeys into one of the most fascinating intellectual adventures of recent decades - understanding and exploring the final fate of massive collapsing stars in the universe. The issue is of great interest in fundamental physics and cosmology today, from both the perspective of gravitation theory and of modern astrophysical observations. This is a revolution in the making and may be intimately connected to our search for a unified understanding of the basic forces of nature, namely gravity that governs the cosmological universe, and the microscopic forces that include quantum phenomena. According to the general theory of relativity, a massive star that collapses catastrophically under its own gravity when it runs out of its internal nuclear fuel must give rise to a space-time singularity. Such singularities are regions in the universe where all physical quantities take their extreme values and become arbitrarily large. The singularities may be covered within a black hole, or visible to faraway observers in the universe. Thus, the final fate of a collapsing massive star is either a black hole or a visible naked singularity. We discuss here recent results and developments on the gravitational collapse of massive stars and possible observational implications when naked singularities happen in the universe. Large collapsing massive stars and the resulting space-time singularities may even provide a laboratory in the cosmos where one could test the unification possibilities of basic forces of nature.

A history of the idea of "black holes" explores the tumultuous debate over the existence of this now well-accepted phenomenon, focusing particular attention on Indian scientist Subrahmanyan Chandrasekhar.

From the author of Guns, Germs and Steel, Jared Diamond's Collapse: How Societies Choose to Fail or Survive is a visionary study of the mysterious downfall of past civilizations. Now in a revised edition with a new afterword, Jared Diamond's Collapse uncovers the secret behind why some societies flourish, while others founder - and what this means for our future. What happened to the people who made the forlorn long-abandoned statues of Easter Island? What happened to the architects of the crumbling Maya pyramids? Will we go the same way, our skyscrapers one day standing derelict and overgrown like the temples at Angkor Wat? Bringing together new evidence from a startling range of sources and piecing together the myriad influences, from climate to culture, that make societies self-destruct, Jared Diamond's Collapse also shows how - unlike our ancestors - we can benefit from our knowledge of the past and learn to be survivors. 'A grand sweep from a master storyteller of the human race' - Daily Mail 'Riveting, superb, terrifying' - Observer 'Gripping ... the book fulfils its huge ambition, and Diamond is the only man who could have written it' - Economis 'This book shines like all Diamond's work' - Sunday Times

In a time of spectacular developments in the new astronomy, the concept of black holes captures top honors. As scientific evidence for them mounts, black holes loom as an ominous development in the life, measured in billions of years, of the universe.

*2018 LOCUS AWARD WINNER OF BEST SCIENCE FICTION NOVEL* *2018 HUGO AWARD FINALIST FOR BEST NOVEL* “John Scalzi is the most entertaining, accessible writer working in SF today.” —Joe Hill, author of The Fireman The first novel of a new space-opera sequence set in an all-new universe by the Hugo Award-winning, New York Times-bestselling author of Redshirts and Old Man's War Our universe is ruled by physics. Faster than light travel is impossible—until the discovery of The Flow, an extradimensional field available at certain points in space-time, which can take us to other planets around other stars. Riding The Flow, humanity spreads to innumerable other worlds. Earth is forgotten. A new empire arises, the Interdependency, based on the doctrine that no one human outpost can survive without the others. It’s a hedge against interstellar war—and, for the empire’s rulers, a system of control. The Flow is eternal—but it’s not static. Just as a river changes course, The Flow changes as well. In rare cases, entire worlds have been cut off from the rest of humanity. When it’s discovered that the entire Flow is moving, possibly separating all human worlds from one another forever, three individuals—a scientist, a starship captain, and the emperox of the Interdependency—must race against time to discover what, if anything, can be salvaged from an interstellar empire on the brink of collapse. "Fans of Game of Thrones and Dune will enjoy this bawdy, brutal, and brilliant political adventure" —Booklist on The Collapsing Empire "Political plotting, plenty of snark, puzzle-solving, and a healthy dose of action...Scalzi continues to be almost insufferably good at his brand of fun but think-y sci-fi adventure." —Kirkus Reviews on The Collapsing Empire “Scalzi is one of the slickest writers that SF has ever produced.” —The Wall Street Journal on The Human Division The Interdependency Series 1. The Collapsing Empire 2. The Consuming Fire At the Publisher's request, this title is being sold without Digital Rights Management Software (DRM) applied.

America is falling, ready to join the Roman Empire as a distant memory in the annals of history. The year is 2027. Tired and desperate, the American people are deep in the middle of The Second Great Depression. The Florida coastline is in ruins from the most powerful hurricane on record; a second just like it is bearing down on the state of Texas. For the first time in history, the Middle East has united as one and amassed the most formidable army the world has seen since the Third Reich. A hidden army of terrorists are on American soil. This is the story of three men - Howard Beck, the world's richest man, also diagnosed with Asperger's Syndrome, Richard Dupree, ex-Navy SEAL turned escaped convict, and Maxwell Harris, a crippled, burned out Chief of Police of a small Texas town. At first they must fight for their own survival against impossible odds. Finally, the three men must band together to save their beloved country from collapse.