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Overwhelmingly Large Telescope
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{{Short description|Proposed extremely large telescope}} {{Use dmy dates|date=December 2021}} {{Infobox telescope}} {{comparison optical telescope primary mirrors.svg|450px}} The '''Overwhelmingly Large Telescope''' ('''OWL''') was a conceptual design by the [[European Southern Observatory]] (ESO) organisation for an [[extremely large telescope]], which was intended to have a single aperture of 100 metres in diameter. Because of the complexity and cost of building a telescope of this unprecedented size, ESO has decided to focus on the 39-metre diameter [[Extremely Large Telescope]] instead.
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