Unfortunately, this book can't be printed from the OpenBook. If you need to print pages from this book, we recommend downloading it as a PDF. Visit NAP.edu/10766 to get more information about this ...

Visit NAP.edu/10766 to get more information about this book, to buy it in print, or to download it as a free PDF. We live in an extraordinary period of exploration. Over the last few decades, humanity ...

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