Manned Space Flight: Present and Future

Manned Space Flight: Present and Future

Author: United States. Congress. House. Committee on Science and Astronautics. Subcommittee on NASA Oversight

Publisher:

Published: 1970

Total Pages: 402

ISBN-13:

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Book Synopsis Manned Space Flight: Present and Future by : United States. Congress. House. Committee on Science and Astronautics. Subcommittee on NASA Oversight

Download or read book Manned Space Flight: Present and Future written by United States. Congress. House. Committee on Science and Astronautics. Subcommittee on NASA Oversight and published by . This book was released on 1970 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:


Pathways to Exploration

Pathways to Exploration

Author: National Research Council

Publisher: National Academies Press

Published: 2014-09-30

Total Pages: 279

ISBN-13: 0309305101

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The United States has publicly funded its human spaceflight program on a continuous basis for more than a half-century, through three wars and a half-dozen recessions, from the early Mercury and Gemini suborbital and Earth orbital missions, to the lunar landings, and thence to the first reusable winged crewed spaceplane that the United States operated for three decades. Today the United States is the major partner in a massive orbital facility - the International Space Station - that is becoming the focal point for the first tentative steps in commercial cargo and crewed orbital space flights. And yet, the long-term future of human spaceflight beyond this project is unclear. Pronouncements by multiple presidents of bold new ventures by Americans to the Moon, to Mars, and to an asteroid in its native orbit, have not been matched by the same commitment that accompanied President Kennedy\'s now fabled 1961 speech-namely, the substantial increase in NASA funding needed to make it happen. Are we still committed to advancing human spaceflight? What should a long-term goal be, and what does the United States need to do to achieve it? Pathways to Exploration explores the case for advancing this endeavor, drawing on the history of rationales for human spaceflight, examining the attitudes of stakeholders and the public, and carefully assessing the technical and fiscal realities. This report recommends maintaining the long-term focus on Mars as the horizon goal for human space exploration. With this goal in mind, the report considers funding levels necessary to maintain a robust tempo of execution, current research and exploration projects and the time/resources needed to continue them, and international cooperation that could contribute to the achievement of spaceflight to Mars. According to Pathways to Exploration, a successful U.S. program would require sustained national commitment and a budget that increases by more than the rate of inflation. In reviving a U.S. human exploration program capable of answering the enduring questions about humanity's destiny beyond our tiny blue planet, the nation will need to grapple with the attitudinal and fiscal realities of the nation today while staying true to a small but crucial set of fundamental principles for the conduct of exploration of the endless frontier. The recommendations of Pathways to Exploration provide a clear map toward a human spaceflight program that inspires students and citizens by furthering human exploration and discovery, while taking into account the long-term commitment necessary to achieve this goal.


Book Synopsis Pathways to Exploration by : National Research Council

Download or read book Pathways to Exploration written by National Research Council and published by National Academies Press. This book was released on 2014-09-30 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt: The United States has publicly funded its human spaceflight program on a continuous basis for more than a half-century, through three wars and a half-dozen recessions, from the early Mercury and Gemini suborbital and Earth orbital missions, to the lunar landings, and thence to the first reusable winged crewed spaceplane that the United States operated for three decades. Today the United States is the major partner in a massive orbital facility - the International Space Station - that is becoming the focal point for the first tentative steps in commercial cargo and crewed orbital space flights. And yet, the long-term future of human spaceflight beyond this project is unclear. Pronouncements by multiple presidents of bold new ventures by Americans to the Moon, to Mars, and to an asteroid in its native orbit, have not been matched by the same commitment that accompanied President Kennedy\'s now fabled 1961 speech-namely, the substantial increase in NASA funding needed to make it happen. Are we still committed to advancing human spaceflight? What should a long-term goal be, and what does the United States need to do to achieve it? Pathways to Exploration explores the case for advancing this endeavor, drawing on the history of rationales for human spaceflight, examining the attitudes of stakeholders and the public, and carefully assessing the technical and fiscal realities. This report recommends maintaining the long-term focus on Mars as the horizon goal for human space exploration. With this goal in mind, the report considers funding levels necessary to maintain a robust tempo of execution, current research and exploration projects and the time/resources needed to continue them, and international cooperation that could contribute to the achievement of spaceflight to Mars. According to Pathways to Exploration, a successful U.S. program would require sustained national commitment and a budget that increases by more than the rate of inflation. In reviving a U.S. human exploration program capable of answering the enduring questions about humanity's destiny beyond our tiny blue planet, the nation will need to grapple with the attitudinal and fiscal realities of the nation today while staying true to a small but crucial set of fundamental principles for the conduct of exploration of the endless frontier. The recommendations of Pathways to Exploration provide a clear map toward a human spaceflight program that inspires students and citizens by furthering human exploration and discovery, while taking into account the long-term commitment necessary to achieve this goal.


Human Spaceflight and Exploration

Human Spaceflight and Exploration

Author: Carol Norberg

Publisher: Springer Science & Business Media

Published: 2013-11-18

Total Pages: 357

ISBN-13: 3642237258

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The book presents a unique overview of activities in human spaceflight and exploration and a discussion of future development possibilities. It provides an introduction for the general public interested in space and would also be suitable for students at university. The book includes the basics of the space environment and the effects of space travel on the human body. It leads through the challenges of designing life support systems for spacecraft as wells as space suits to protect astronauts during extravehicular activities. Research being carried out by humans in Earth orbit is being brought into context to other forms of space exploration. Between the end of 2007 and May 2009 ESA, the European Space Agency, carried out an astronaut recruitment process. It was the first time that astronauts had been recruited newly to the corps since its creation in 1998 and the positions were open to citizens of all of the member states of ESA. Two of the contributors to this book participated in the selection process and hence contribute to a general discussion of how one carries out such a selection programme. The book concludes with one person’s experience of flying aboard the space shuttle on a mission to map planet Earth, bringing together topics taken up in earlier parts of the book.


Book Synopsis Human Spaceflight and Exploration by : Carol Norberg

Download or read book Human Spaceflight and Exploration written by Carol Norberg and published by Springer Science & Business Media. This book was released on 2013-11-18 with total page 357 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents a unique overview of activities in human spaceflight and exploration and a discussion of future development possibilities. It provides an introduction for the general public interested in space and would also be suitable for students at university. The book includes the basics of the space environment and the effects of space travel on the human body. It leads through the challenges of designing life support systems for spacecraft as wells as space suits to protect astronauts during extravehicular activities. Research being carried out by humans in Earth orbit is being brought into context to other forms of space exploration. Between the end of 2007 and May 2009 ESA, the European Space Agency, carried out an astronaut recruitment process. It was the first time that astronauts had been recruited newly to the corps since its creation in 1998 and the positions were open to citizens of all of the member states of ESA. Two of the contributors to this book participated in the selection process and hence contribute to a general discussion of how one carries out such a selection programme. The book concludes with one person’s experience of flying aboard the space shuttle on a mission to map planet Earth, bringing together topics taken up in earlier parts of the book.


The Mars Challenge

The Mars Challenge

Author: Benjamin A. Wilgus

Publisher: First Second

Published: 2020-06-16

Total Pages: 210

ISBN-13: 1250794951

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Travel to deep space and back again with The Mars Challenge, a nonfiction graphic novel for teens about the science and logistics of a manned mission to Mars. Nadia is a teen with a dream: to be the first woman on Mars. But to get there, she's got to learn all she can about the science of spaceflight. It's a good thing her friend Eleanor is an Attitude Determination and Control Officer—basically, she pilots the International Space Station! Eleanor takes Nadia on a conceptual journey through an entire crewed mission to Mars, and explains every challenge that must be overcome along the way; from escaping Earth's gravity well, to keeping the crew healthy as they travel through deep space, to setting up a Mars base, to having enough fuel for the trip home! In The Mars Challenge, writer Benjamin A. Wilgus and artist Wyeth Yates bring the reader on a thrilling interplanetary voyage and clearly illustrate the scientific concepts and complex machinery involved. Humans can reach Mars in our lifetime—this book explains how it can be done.


Book Synopsis The Mars Challenge by : Benjamin A. Wilgus

Download or read book The Mars Challenge written by Benjamin A. Wilgus and published by First Second. This book was released on 2020-06-16 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Travel to deep space and back again with The Mars Challenge, a nonfiction graphic novel for teens about the science and logistics of a manned mission to Mars. Nadia is a teen with a dream: to be the first woman on Mars. But to get there, she's got to learn all she can about the science of spaceflight. It's a good thing her friend Eleanor is an Attitude Determination and Control Officer—basically, she pilots the International Space Station! Eleanor takes Nadia on a conceptual journey through an entire crewed mission to Mars, and explains every challenge that must be overcome along the way; from escaping Earth's gravity well, to keeping the crew healthy as they travel through deep space, to setting up a Mars base, to having enough fuel for the trip home! In The Mars Challenge, writer Benjamin A. Wilgus and artist Wyeth Yates bring the reader on a thrilling interplanetary voyage and clearly illustrate the scientific concepts and complex machinery involved. Humans can reach Mars in our lifetime—this book explains how it can be done.


Manned Spacecraft Design Principles

Manned Spacecraft Design Principles

Author: Pasquale M Sforza

Publisher: Elsevier

Published: 2015-11-13

Total Pages: 647

ISBN-13: 0124199763

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Manned Spacecraft Design Principles presents readers with a brief, to-the-point primer that includes a detailed introduction to the information required at the preliminary design stage of a manned space transportation system. In the process of developing the preliminary design, the book covers content not often discussed in a standard aerospace curriculum, including atmospheric entry dynamics, space launch dynamics, hypersonic flow fields, hypersonic heat transfer, and skin friction, along with the economic aspects of space flight. Key concepts relating to human factors and crew support systems are also included, providing users with a comprehensive guide on how to make informed choices from an array of competing options. The text can be used in conjunction with Pasquale Sforza's, Commercial Aircraft Design Principles to form a complete course in Aircraft/Spacecraft Design. Presents a brief, to-the-point primer that includes a detailed introduction to the information required at the preliminary design stage of a manned space transportation system Involves the reader in the preliminary design of a modern manned spacecraft and associated launch vehicle Includes key concepts relating to human factors and crew support systems Contains standard, empirical, and classical methods in support of the design process Culminates in the preparation of a professional quality design report


Book Synopsis Manned Spacecraft Design Principles by : Pasquale M Sforza

Download or read book Manned Spacecraft Design Principles written by Pasquale M Sforza and published by Elsevier. This book was released on 2015-11-13 with total page 647 pages. Available in PDF, EPUB and Kindle. Book excerpt: Manned Spacecraft Design Principles presents readers with a brief, to-the-point primer that includes a detailed introduction to the information required at the preliminary design stage of a manned space transportation system. In the process of developing the preliminary design, the book covers content not often discussed in a standard aerospace curriculum, including atmospheric entry dynamics, space launch dynamics, hypersonic flow fields, hypersonic heat transfer, and skin friction, along with the economic aspects of space flight. Key concepts relating to human factors and crew support systems are also included, providing users with a comprehensive guide on how to make informed choices from an array of competing options. The text can be used in conjunction with Pasquale Sforza's, Commercial Aircraft Design Principles to form a complete course in Aircraft/Spacecraft Design. Presents a brief, to-the-point primer that includes a detailed introduction to the information required at the preliminary design stage of a manned space transportation system Involves the reader in the preliminary design of a modern manned spacecraft and associated launch vehicle Includes key concepts relating to human factors and crew support systems Contains standard, empirical, and classical methods in support of the design process Culminates in the preparation of a professional quality design report


Recapturing a Future for Space Exploration

Recapturing a Future for Space Exploration

Author: National Research Council

Publisher: National Academies Press

Published: 2012-01-30

Total Pages: 464

ISBN-13: 0309163846

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More than four decades have passed since a human first set foot on the Moon. Great strides have been made in our understanding of what is required to support an enduring human presence in space, as evidenced by progressively more advanced orbiting human outposts, culminating in the current International Space Station (ISS). However, of the more than 500 humans who have so far ventured into space, most have gone only as far as near-Earth orbit, and none have traveled beyond the orbit of the Moon. Achieving humans' further progress into the solar system had proved far more difficult than imagined in the heady days of the Apollo missions, but the potential rewards remain substantial. During its more than 50-year history, NASA's success in human space exploration has depended on the agency's ability to effectively address a wide range of biomedical, engineering, physical science, and related obstacles-an achievement made possible by NASA's strong and productive commitments to life and physical sciences research for human space exploration, and by its use of human space exploration infrastructures for scientific discovery. The Committee for the Decadal Survey of Biological and Physical Sciences acknowledges the many achievements of NASA, which are all the more remarkable given budgetary challenges and changing directions within the agency. In the past decade, however, a consequence of those challenges has been a life and physical sciences research program that was dramatically reduced in both scale and scope, with the result that the agency is poorly positioned to take full advantage of the scientific opportunities offered by the now fully equipped and staffed ISS laboratory, or to effectively pursue the scientific research needed to support the development of advanced human exploration capabilities. Although its review has left it deeply concerned about the current state of NASA's life and physical sciences research, the Committee for the Decadal Survey on Biological and Physical Sciences in Space is nevertheless convinced that a focused science and engineering program can achieve successes that will bring the space community, the U.S. public, and policymakers to an understanding that we are ready for the next significant phase of human space exploration. The goal of this report is to lay out steps and develop a forward-looking portfolio of research that will provide the basis for recapturing the excitement and value of human spaceflight-thereby enabling the U.S. space program to deliver on new exploration initiatives that serve the nation, excite the public, and place the United States again at the forefront of space exploration for the global good.


Book Synopsis Recapturing a Future for Space Exploration by : National Research Council

Download or read book Recapturing a Future for Space Exploration written by National Research Council and published by National Academies Press. This book was released on 2012-01-30 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: More than four decades have passed since a human first set foot on the Moon. Great strides have been made in our understanding of what is required to support an enduring human presence in space, as evidenced by progressively more advanced orbiting human outposts, culminating in the current International Space Station (ISS). However, of the more than 500 humans who have so far ventured into space, most have gone only as far as near-Earth orbit, and none have traveled beyond the orbit of the Moon. Achieving humans' further progress into the solar system had proved far more difficult than imagined in the heady days of the Apollo missions, but the potential rewards remain substantial. During its more than 50-year history, NASA's success in human space exploration has depended on the agency's ability to effectively address a wide range of biomedical, engineering, physical science, and related obstacles-an achievement made possible by NASA's strong and productive commitments to life and physical sciences research for human space exploration, and by its use of human space exploration infrastructures for scientific discovery. The Committee for the Decadal Survey of Biological and Physical Sciences acknowledges the many achievements of NASA, which are all the more remarkable given budgetary challenges and changing directions within the agency. In the past decade, however, a consequence of those challenges has been a life and physical sciences research program that was dramatically reduced in both scale and scope, with the result that the agency is poorly positioned to take full advantage of the scientific opportunities offered by the now fully equipped and staffed ISS laboratory, or to effectively pursue the scientific research needed to support the development of advanced human exploration capabilities. Although its review has left it deeply concerned about the current state of NASA's life and physical sciences research, the Committee for the Decadal Survey on Biological and Physical Sciences in Space is nevertheless convinced that a focused science and engineering program can achieve successes that will bring the space community, the U.S. public, and policymakers to an understanding that we are ready for the next significant phase of human space exploration. The goal of this report is to lay out steps and develop a forward-looking portfolio of research that will provide the basis for recapturing the excitement and value of human spaceflight-thereby enabling the U.S. space program to deliver on new exploration initiatives that serve the nation, excite the public, and place the United States again at the forefront of space exploration for the global good.


The Future of Human Space Exploration

The Future of Human Space Exploration

Author: Giovanni Bignami

Publisher: Springer

Published: 2016-06-30

Total Pages: 205

ISBN-13: 1137526580

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For several decades it has been widely accepted that human space exploration is the exclusive domain of government agencies. The cost of performing such missions, estimated in multiple reports to amount to hundreds of billions dollars over decades, was far beyond what private entities could afford. That arrangement seems to be changing. Buoyed by the success of its program to develop commercial cargo capabilities to support the International Space Station, NASA is becoming increasingly open to working with the private sector in its human space exploration plans. The new private-public partnership will make 'planet hopping' feasible. This book analyses the move towards planet hopping, which sees human outposts moving across the planetary dimensions, from the Moon to Near-Earth Asteroids and Mars. It critically assesses the intention to exploit space resources and how successful these missions will be for humanity. This insightful and accessible book will be of great interest to scholars and students of space policy and politics, international studies, and science and technology studies.


Book Synopsis The Future of Human Space Exploration by : Giovanni Bignami

Download or read book The Future of Human Space Exploration written by Giovanni Bignami and published by Springer. This book was released on 2016-06-30 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: For several decades it has been widely accepted that human space exploration is the exclusive domain of government agencies. The cost of performing such missions, estimated in multiple reports to amount to hundreds of billions dollars over decades, was far beyond what private entities could afford. That arrangement seems to be changing. Buoyed by the success of its program to develop commercial cargo capabilities to support the International Space Station, NASA is becoming increasingly open to working with the private sector in its human space exploration plans. The new private-public partnership will make 'planet hopping' feasible. This book analyses the move towards planet hopping, which sees human outposts moving across the planetary dimensions, from the Moon to Near-Earth Asteroids and Mars. It critically assesses the intention to exploit space resources and how successful these missions will be for humanity. This insightful and accessible book will be of great interest to scholars and students of space policy and politics, international studies, and science and technology studies.


Preparing for the High Frontier

Preparing for the High Frontier

Author: National Research Council

Publisher: National Academies Press

Published: 2011-11-09

Total Pages: 114

ISBN-13: 0309218705

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As the National Aeronautics and Space Administration (NASA) retires the Space Shuttle and shifts involvement in International Space Station (ISS) operations, changes in the role and requirements of NASA's Astronaut Corps will take place. At the request of NASA, the National Research Council (NRC) addressed three main questions about these changes: what should be the role and size of Johnson Space Center's (JSC) Flight Crew Operations Directorate (FCOD); what will be the requirements of astronaut training facilities; and is the Astronaut Corps' fleet of training aircraft a cost-effective means of preparing astronauts for NASA's spaceflight program? This report presents an assessment of several issues driven by these questions. This report does not address explicitly the future of human spaceflight.


Book Synopsis Preparing for the High Frontier by : National Research Council

Download or read book Preparing for the High Frontier written by National Research Council and published by National Academies Press. This book was released on 2011-11-09 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the National Aeronautics and Space Administration (NASA) retires the Space Shuttle and shifts involvement in International Space Station (ISS) operations, changes in the role and requirements of NASA's Astronaut Corps will take place. At the request of NASA, the National Research Council (NRC) addressed three main questions about these changes: what should be the role and size of Johnson Space Center's (JSC) Flight Crew Operations Directorate (FCOD); what will be the requirements of astronaut training facilities; and is the Astronaut Corps' fleet of training aircraft a cost-effective means of preparing astronauts for NASA's spaceflight program? This report presents an assessment of several issues driven by these questions. This report does not address explicitly the future of human spaceflight.


Space 2.0

Space 2.0

Author: Rod Pyle

Publisher: BenBella Books

Published: 2019-02-26

Total Pages: 336

ISBN-13: 1946885746

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We're on the cusp of new era in the great adventure of space exploration. More than a half-century ago, humanity first hurled objects into space, and almost 50 years ago, astronauts first walked on the moon. Since then, we have explored Earth's orbit with shuttles, capsules, and space stations; sent robots to Mars, Venus, Mercury, Jupiter, Saturn, and Uranus; sampled a comet; sent telescopes into orbit; and charted most of our own planet. What does the future hold? In Space 2.0, space historian Rod Pyle, in collaboration with the National Space Society, will give you an inside look at the next few decades of spaceflight and long-term plans for exploration, utilization, and settlement. No longer the exclusive domain of government entities such as NASA and other national agencies, space exploration is rapidly becoming privatized, with entrepreneurial startups building huge rocket boosters, satellites, rocket engines, asteroid probes, prospecting craft, and even commercial lunar cargo landers to open this new frontier. Research into ever more sophisticated propulsion and life support systems will soon enable the journey to Mars and destinations deeper in our solar system. As these technologies continue to move forward, there are virtually no limits to human spaceflight and robotic exploration. While the world has waited since the Apollo lunar program for the next "giant leap," these critical innovations, most of which are within our grasp with today's technology, will change the way we live, both in space and on Earth. A new space age—and with it, a new age of peace and prosperity on Earth, and settlement beyond our planet—can be ours. Speaking with key leaders of the latest space programs and innovations, Pyle shares the excitement and promise of this new era of exploration and economic development. From NASA and the Russian space agency Roscosmos, to emerging leaders in the private sector such as SpaceX, Blue Origin, Moon Express, Virgin Galactic, and many others, Space 2.0 examines the new partnerships that are revolutionizing spaceflight and changing the way we reach for the stars.


Book Synopsis Space 2.0 by : Rod Pyle

Download or read book Space 2.0 written by Rod Pyle and published by BenBella Books. This book was released on 2019-02-26 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: We're on the cusp of new era in the great adventure of space exploration. More than a half-century ago, humanity first hurled objects into space, and almost 50 years ago, astronauts first walked on the moon. Since then, we have explored Earth's orbit with shuttles, capsules, and space stations; sent robots to Mars, Venus, Mercury, Jupiter, Saturn, and Uranus; sampled a comet; sent telescopes into orbit; and charted most of our own planet. What does the future hold? In Space 2.0, space historian Rod Pyle, in collaboration with the National Space Society, will give you an inside look at the next few decades of spaceflight and long-term plans for exploration, utilization, and settlement. No longer the exclusive domain of government entities such as NASA and other national agencies, space exploration is rapidly becoming privatized, with entrepreneurial startups building huge rocket boosters, satellites, rocket engines, asteroid probes, prospecting craft, and even commercial lunar cargo landers to open this new frontier. Research into ever more sophisticated propulsion and life support systems will soon enable the journey to Mars and destinations deeper in our solar system. As these technologies continue to move forward, there are virtually no limits to human spaceflight and robotic exploration. While the world has waited since the Apollo lunar program for the next "giant leap," these critical innovations, most of which are within our grasp with today's technology, will change the way we live, both in space and on Earth. A new space age—and with it, a new age of peace and prosperity on Earth, and settlement beyond our planet—can be ours. Speaking with key leaders of the latest space programs and innovations, Pyle shares the excitement and promise of this new era of exploration and economic development. From NASA and the Russian space agency Roscosmos, to emerging leaders in the private sector such as SpaceX, Blue Origin, Moon Express, Virgin Galactic, and many others, Space 2.0 examines the new partnerships that are revolutionizing spaceflight and changing the way we reach for the stars.


Issues and Opportunities Regarding the U.S. Space Program

Issues and Opportunities Regarding the U.S. Space Program

Author: National Research Council

Publisher: National Academies Press

Published: 2004-03-02

Total Pages: 92

ISBN-13: 0309091462

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Ever since the completion of the Apollo program, there has been a lack of consensus about the future of human spaceflight. The Columbia tragedy in February 2003 rekindled public debate about this question. In November 2003, the Space Studies Board and the Aeronautics and Space Engineering Board organized a workshop to explore aspects of the question, what should be the principal purpose, goals, and priorities of the U.S. civil space program? This report presents a factual summary of that workshop, which identified past lessons learned and guiding principles for the future of the civil space program. Seven broad themes emerged from the workshop, and these themes are highlighted in the report. The report also presents discussions of strategies for the human spaceflight program and guiding principles of and boundary conditions for a 21st century space policy.


Book Synopsis Issues and Opportunities Regarding the U.S. Space Program by : National Research Council

Download or read book Issues and Opportunities Regarding the U.S. Space Program written by National Research Council and published by National Academies Press. This book was released on 2004-03-02 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ever since the completion of the Apollo program, there has been a lack of consensus about the future of human spaceflight. The Columbia tragedy in February 2003 rekindled public debate about this question. In November 2003, the Space Studies Board and the Aeronautics and Space Engineering Board organized a workshop to explore aspects of the question, what should be the principal purpose, goals, and priorities of the U.S. civil space program? This report presents a factual summary of that workshop, which identified past lessons learned and guiding principles for the future of the civil space program. Seven broad themes emerged from the workshop, and these themes are highlighted in the report. The report also presents discussions of strategies for the human spaceflight program and guiding principles of and boundary conditions for a 21st century space policy.