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This segment looks at the state of astronomy before Hubble and the difficulties of observing from the ground that drove the need for a space telescope. Astronomers instrumental in the Hubble project in the 60s and 70s reflect on how the design of the telescope was forced to evolve because methods used by ground-based observatories weren't practical in space. Download this video: http://www.nasa.gov/downloadable/videos/hubble-_the_beginning.mp4