Space travel is a familiar concept. Such was not the case in the early 20th century, when the United States and the former Soviet Union were locked in a race to send humans into orbit. This book details the history of manned spaceflight, from the development of rockets to the advent of space tourism. Readers also are introduced to the men and women who have been willing to soar into the great unknown.
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格式 PDF ● 网页 208 ● ISBN 9781615300396 ● 编辑 Erik Gregersen ● 出版者 Britannica Educational Publishing ● 发布时间 2009 ● 下载 6 时 ● 货币 EUR ● ID 5750640 ● 复制保护 Adobe DRM
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