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![Present and future observatories compared to a marvel from the past. The E-ELT dome will be 100 metres in diameter, about the size of the Colosseum in Rome, but atop a 3000-metre mountaintop. For comparison, each of the four VLT unit telescopes are 25 metres high, about the size of an eight-storey building. This picture is based on a preliminary design for the E-ELT.]()
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![galaxy_EGSY8p7]()
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