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This unit looks at how telescopes and spectrographs are designed to improve our ability to observe the universe. You will examine how different technologies have been developed over the last four hundred years to enable us to look deep into space. This study unit is just one of many that can be found on LearningSpace, part of OpenLearn, a collection of open educational resources from The Open University. Published in ePub 2.0.1 format, some feature such as audio, video and linked PDF are not supported by all ePub readers.