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Humankind's forays into outer space have symbolized an era of discovery and scientific achievement unrivalled in human history. This exciting historical period is surveyed in this encyclopedia which provides the answers to crucial questions readers have about the Universe and their place in it. In one easy-to-use resource, readers can have access to definitions and explanations of all terms and concepts relating to the field, including technical terms, advanced technologies, scientific theories, public agencies and private organizations.