The decision announced by John F. Kennedy on May 25, 1961, initiating the expedition to the moon, is now documented in full for future students of history. To John Logsdon, whose approach is that of a political scientist examining the influence of men and events on the decision-making process, the decision to land a man on the moon "before this decade is out" was wholly political rather than military, although overtones of implied defense were useful in obtaining congressional support. Moreover, he notes it was made without the support of the scientific community, although their previous research efforts were expected partially to offset this deterrent.Although the success of the Russian manned orbit and the fiasco of the Bay of Pigs invasion certainly influenced the timing, in the author's interpretation the Kennedy decision manages to escape the narrow definition of a public relations exhibition. In Kennedy's view, he emphasizes, the security of the country itself was inseparably linked to a position of prestige in world opinion. Nor was he a particular enthusiast of space exploration for its own rewards. As he remarked to one of his advisors, "If you had a scientific spectacular on this earth that would be more useful--say desalting the ocean--or something just as dramatic and convincing as space, then we would do "that.""The thoroughness of this book as a historical record is evident throughout. NASA historical records and government documents not previously released, including several Presidential papers, are used in the analysis, and the author weaves these records together with subtleties of opinion from interviews with NASA officials and such Kennedy advisors as Theodore Sorenson, McGeorge Bundy, David Bell, and Jerome Wiesner.
Winner of the Summerfield Book Award. The next great leap for jet propulsion will be to power-sustained, efficient flight through the atmosphere.
can explore the Cullman Hall of the Universe , an interactive exhibit that is divided into four zones , each illuminating the processes that led to the creation of the planets , stars , galaxies , and the universe , respectively .
该书卷一《唐尧》篇有这样一段文字“尧登位三十年,有巨查浮于西海,查上有光,夜明昼灭,海人望其光,乍大乍小,若星月之出入矣。查常浮绕四海,十二年一周天,周而复始,名日贯月查,亦谓挂星查。羽人栖息其上,群仙含露以漱,日月之光则如螟矣。虞夏之季, ...
唯有威廉·康格里夫。威廉·康格里夫是英国肯特郡人,毕业于剑桥大学法学系,曾在英国皇家炮兵部队服过兵役。1801年,康格里夫倾其所有搜集了伦敦市面上几乎所有的大号火箭,开始了火箭武器的研制工作。康格里夫从来没有去过印度,他关于印度迈索尔火箭的所有 ...
后来替杰夫在担任发动机总经理的丹尼斯·黑记得当时杰夫这样他说过:当我刚刚的时候,他们还在亏损,我问他们,现在的订单有多,他们说有180辆。此我提了价格,3个月后,我再问,订单量变成了500,我继续调价格,又过了3个月,订单量变成了1000辆。丹尼斯,我们不是在 ...
例如,美国军的约翰·C.史丹尼斯(John C. Stennis)舰上有74架固飞机,但是需要大约5984名乘员,其中3184人操作舰,2800人负责军事务。该舰的水量达 102000吨。皇军和其他军已经造了轻型舰,水量都在10000~20000吨间,并采用了“鹞”式短起飞落飞机。
翟志刚的爱人张淑静是他的战友,张淑静在航天食品研究部门工作,航天员的饮食计划都是她所在的单位研究制定的。1994年,张淑静与翟志刚结婚,婚后两人非常恩爱。“神五”发射成功后,面对媒体的采访,张淑静曾对翟志刚有三句话的评价:“他是很负责、温情的丈夫; ...
其中美国的“水手10号”宇宙探测器3次飞过水星,发回了6000张水星照片。“先驱者1号”、“先驱者2号”和前苏联的“金星11号”、“金星12号”等探测器都曾飞近金星进行探测,并在金星上软着陆成功,取得了宝贵的成果。为了探测火星上究竟有没有生命,美国和前苏联还发射 ...
同年10月4日“月球”3号探测器飞往月球,3天后环绕到月球背面,拍摄了第一张月球背面的照片,让人们首次看全了月球的面貌。世界上率先在月球软着陆的探测器,是1966年1月31日发射的“月球”9 号。它经过79小时的长途飞行之后,在月球的风暴洋附近着陆,用摄像机拍摄 ...
上述各式各样的卫星,不仅用途不同,其外形也呈现出千姿百态,有球形、锥形、圆柱形,有的伸出长长的“触角”,有的则张着庞大的“翅膀”;有的像翩翩起舞的蝴蝶,有的又像戴在帝王头上的“皇冠”。卫星外形这样奇形怪状,这并非是科学家随心所欲之作,而主要是根据卫星 ...