Bøger af Les Johnson

A brief guide to the real science of interstellar travel With known exoplanets now numbering in the thousands and initiatives like 100 Year Starship and Breakthrough Starshot advancing the idea of interstellar travel, the age-old dream of venturing forth into the cosmos and perhaps even colonizing distant worlds may one day become a reality. A Traveler's Guide to the Stars reveals how. Les Johnson takes you on a thrilling tour of the physics and technologies that may enable us to reach the stars. He discusses the latest exoplanet discoveries, promising interstellar missions on the not-so-distant horizon, and exciting new developments in space propulsion, power, robotics, communications, and more. But interstellar travel will not be easy, and it is not for the faint of heart. Johnson describes the harsh and forbidding expanse of space that awaits us, and he addresses the daunting challenges--both human and technological--that we will need to overcome in order to realize tomorrow's possibilities. A Traveler's Guide to the Stars is your passport to the next great frontier of human discovery, providing a rare inside look at the remarkable breakthroughs in science and technology that will help tomorrow's space travelers chart a course for the stars.

The NASA Technical Reports Servcr (NTRS) houses half a million publications that are a valuable means of information to researchers, teachers, students, and the general public. These documents are all aerospace related with much scientific and technical information created or funded by NASA. Some types of documents include conference papers, research reports, meeting papers, journal articles and more. This is one of those documents.

The NASA Technical Reports Servcr (NTRS) houses half a million publications that are a valuable means of information to researchers, teachers, students, and the general public. These documents are all aerospace related with much scientific and technical information created or funded by NASA. Some types of documents include conference papers, research reports, meeting papers, journal articles and more. This is one of those documents.

The NASA Technical Reports Servcr (NTRS) houses half a million publications that are a valuable means of information to researchers, teachers, students, and the general public. These documents are all aerospace related with much scientific and technical information created or funded by NASA. Some types of documents include conference papers, research reports, meeting papers, journal articles and more. This is one of those documents.

"Traveling to the stars will be difficult, but not, perhaps, the most difficult part. What about when we get to another star? What then? Will the planets be immediately habitable? Not likely. Will those who undertook the journey be able to easily turn around and come home if they don't find "Earth 2.0?" Almost certainly not. Therein the lies the challenge: Finding worlds that are potentially habitable and then taking the time, perhaps centuries, to make them compatible with Earth life. They will encounter mysteries and unexpected challenges, but the human spirit will endure. Join this diverse group of science fiction writers and scientists as they take up the challenge of The Ross 248 Project"--

Interstellar Travel: Purpose and Motivations is a comprehensive, technical look at the necessary considerations for interstellar travel addressed by leading experts in the field, from scientists studying possible destinations (exoplanets) and the vast distances between, to those concerned with building institutions and capabilities in society that could sustain such endeavors. In addition to the technical, medical, and anthropological aspects of deep space travel, the ethics and morality of spreading Earth-based life to other worlds is also examined. In the first book of a three-book compilation, Interstellar Travel: Purpose and Motivations offers in-depth, up-to-date and realistic technical and scientific considerations in the pursuit of interstellar travel and is an integral reference for scientists, engineers, researchers and academics working on, or interested in, space development and space technologies. With a renewed interest in space exploration and development evidenced by the rise of the commercial space sector and various governments now planning to send humans back to the moon and to Mars, so also is interest in taking the next steps beyond the Solar System and to the ultimate destination - planets circling other stars.

A BRILLIANT BLEND OF MILITARY SCIENCE FICTION AND ARTHUR C. CLARKE-LEVEL SPECULATIVE WONDER  BY A WORKING SPACE SCIENTIST!NO TIME LIKE THE PRESENT Humanity has finally made it to the stars. Colony worlds thrive and there is general peace among the settled systems. Until now. Matte black ships of an advanced design appear in colonial systems. Their drives and weapons are not extremely advanced beyond their Terran counterparts—just superior enough to be utterly devastating. Colonies and their populations are obliterated. Once-settled worlds are rendered radioactive wastelands. Earth herself lies defenseless before the marauding enemy. DEFEND THE SKIES OF EARTH Standing against the invasion are two of humanity’s finest starship captains: Winslow Price of the British Space Navy and Anika Ahuja of the Indian Space Forces. Compatriots. Fierce competitors. Former lovers. Now they are on a quest that will plumb the scientific wells of existence, where the primordial knot of spacetime may be unraveling. Price and Ahuja are sworn to do whatever it takes to defend Earth and humanity from ultimate obliteration by an enemy that will not even speak its name. Even if it pushes each to the brink of life and death in battle. Even if it leads each beyond space and time—and to the edge of ultimate possibility! TAKE THE BATTLE TO THE STARS “Johnson, a NASA physicist, brings verisimilitude and scientific accuracy to this adventure, and his passion for the details of space travel will undoubtedly please readers looking for old-school hard science fiction.”  —Publishers Weekly About Mission to Methone: “The spirit of Arthur C. Clarke and his contemporaries is alive and well in Johnson’s old-fashioned first-contact novel, set in 2068. . . . includes plenty of realistic detail and puts fun new spins on familiar alien concepts. . . . There’s a great deal here for fans of early hard SF.”—Publishers Weekly “With equal parts science fiction and international intrigue . . . an exciting, fast-paced read that you will not want to put down.”—Booklist About Rescue Mode by Ben Bova and Les Johnson: “. . . a suspenseful and compelling narrative of the first human spaceflight to Mars.”—Booklist

A BRILLIANT BLEND OF MILITARY SCIENCE FICTION AND ARTHUR C. CLARKE-LEVEL SPECULATIVE WONDER  BY A WORKING SPACE SCIENTIST!NO TIME LIKE THE PRESENT Humanity has finally made it to the stars. Colony worlds thrive and there is general peace among the settled systems. Until now. Matte black ships of an advanced design appear in colonial systems. Their drives and weapons are not extremely advanced beyond their Terran counterparts — just superior enough to be utterly devastating. Colonies and their populations are obliterated. Once settled worlds are rendered radioactive wastelands. Earth herself lies defenseless before the marauding enemy. DEFEND THE SKIES OF EARTH Standing against the invasion are two of humanity’s finest starship captains, Winslow Price of the British Space Navy and Anika Ahuja of the Indian Space Forces. Compatriots. Fierce competitors. Former lovers. Now they are on a quest that will plumb the scientific wells of existence itself, where the primordial knot of spacetime may be unraveling. Price and Ahuja are sworn to do whatever it takes to defend Earth and humanity from ultimate obliteration by an enemy that will not even speak its name. Even if it pushes each to the brink of life and death in battle. Even if it leads each beyond space and time—and to the edge of ultimate possibility! TAKE THE BATTLE TO THE STARS About Mission to Methone: “The spirit of Arthur C. Clarke and his contemporaries is alive and well in Johnson’s old-fashioned first-contact novel, set in 2068. . . . includes plenty of realistic detail and puts fun new spins on familiar alien concepts. . . . There’s a great deal here for fans of early hard SF.”—Publishers Weekly “With equal parts science fiction and international intrigue . . . an exciting, fast-paced read that you will not want to put down.”—Booklist About Rescue Mode by Ben Bova and Les Johnson: “. . . a suspenseful and compelling narrative of the first human spaceflight to Mars.”—Booklist

THE STARS WILL CHANGE US. STORIES AND ESSAYS FROM TOP AUTHORS AND EXPERT SCIENTISTS. Explorations of how interstellar travel may affect humanity by best-selling authors and scientists.BECOMING THE PEOPLE OF THE STARS Fundamental transformation. That is what it may take to reach our final destination. And we may not have a choice as dangers from without and pressure from within human civilization force us to adapt to a new star-traveling heritage. We may find that Homo sapiens is on its way to becoming a new and unique species-Homo stellaris: people of the stars. A BOUNDLESS SENSE OF WHAT'S POSSIBLE Inspired by a gathering of scientists, science fiction authors, and futurists at a series of annual meetings held by the Tennessee Valley Interstellar Workshop, here are original science fiction stories and accessible speculative pieces by top scientists that will take you to that future! Enjoy stories from award-winning authors such as Kevin J. Anderson, William Ledbetter, Todd McCaffrey, and Sarah A. Hoyt, plus essays on the science behind the fiction from Martin Rees, Astronomer Royal of the United Kingdom, Mark Shelhamer, Chief Scientist for NASA's Human Research Program, and more! About Stellaris: People of the Stars: "[A] thought-provoking look at a selection of real-world challenges and speculative fiction solutions. . . . Readers will enjoy this collection that is as educational as it is entertaining."-Booklist "This was an enjoyable collection of science fiction dealing with colonizing the stars. In the collection were several gems and the overall quality was high."-Tangent ". . . offers readers a view what of might be our future in space."-Richochet About Mission to Methone, by Les Johnson: "The spirit of Arthur C. Clarke and his contemporaries is alive and well in Johnson's old-fashioned first-contact novel, set in 2068. . . . includes plenty of realistic detail and puts fun new spins on familiar alien concepts. . . . There's a great deal here for fans of early hard SF."-Publishers Weekly "With equal parts science fiction and international intrigue. . . . an exciting, fast-paced read that you will not want to put down."-Booklist About Rescue Mode, by Ben Bova and Les Johnson: ". . . a suspenseful and compelling narrative of the first human spaceflight to Mars."-Booklist

"A Baen Books original"--Copyright page.

The first human mission to Mars meets with near-disaster when a meteoroid strikes the spacecraft, almost destroying it. The ship is too far from Earth to simply turn around and return home. The eight-person crew must ride their crippled ship to Mars while they desperately struggle to survive.

Space-based terrestrial power generation systems will work synergistically with Earth-based conservation. This book needs to be read urgently and widely, if we are to save ourselves from environmental disaster, reduce the risk of catastrophic cosmic impacts, and build a prosperous and sustainable future for all the creatures of Earth.

The reality of sunlight-based sailing in space began in May 2010, and solar sail technology and science have continued to evolve rapidly through new space missions. It also discusses various sail systems that may use either sunlight or solar wind, and the design, fabrication and steering challenges associated with solar sails.

This book presents a visionary concept for future development of space travel. It describes the enabling technology for future propulsion concepts and demonstrates how mankind will 'live off the land in space' in migration from Earth.

Part III of the book looks at how we can protect our satellites, preparing for the worst, reducing the growth and amount of orbital debris, preventing acts of war in space and hardening against space radiation.