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2. List of largest optical reflecting telescopes - Wikipedia

   en.wikipedia.org/wiki/List_of_largest_optical...

   This table does not include all the largest mirrors manufactured. The Steward Observatory Mirror Lab produced the 6.5 metre f/1.25 collimator used in the Large Optical Test and Integration Site of Lockheed Martin, used for vacuum optical testing of other telescopes. Segmented mirrors are also referred to as mosaic mirrors. Single mirrors are ...

3. Overwhelmingly Large Telescope - Wikipedia

   en.wikipedia.org/wiki/Overwhelmingly_Large_Telescope

   Experience gained in existing segmented mirrors (for example, the Keck telescope) suggests that the mirror proposed for the OWL is feasible. However, the projected cost (of around €1.5 billion) was considered too high, so the ESO is now building the smaller Extremely Large Telescope around 39 m in diameter.

4. Extremely large telescope - Wikipedia

   en.wikipedia.org/wiki/Extremely_large_telescope

   Comparison of nominal sizes of apertures of the above extremely large telescopes and some notable optical telescopes. An extremely large telescope (ELT) is an astronomical observatory featuring an optical telescope with an aperture for its primary mirror from 20 metres up to 100 metres across, [1] [2] when discussing reflecting telescopes of optical wavelengths including ultraviolet (UV ...

5. MMT Observatory - Wikipedia

   en.wikipedia.org/wiki/MMT_Observatory

   This made it possible to replace the six mirrors with a single 6.5-meter mirror. The original building and part of the structure were reused. The new mirror was the first of its size to be cast and polished in the Steward Observatory Mirror Laboratory. The updated MMT, its name no longer an acronym, [2] was rededicated on 20 May 2000. [3]

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   Get some last-minute shopping done at the Kate Spade Outlet sale — up to 70% off plus an extra 25% off select gifts. AOL. The 20 best gifts to give someone you don't know very well. AOL.

7. The 15 best sales this weekend: Toys, bedding, laptops and more

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   Ages: 12 months+. These colorful plastic blocks are a classic gift for two year olds for good reason: the large size pieces are easy for them to manipulate, and don’t pose a choking hazard like ...