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Old 09-01-2018, 05:50 AM
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skysurfer
Dark sky rules !

skysurfer is offline
 
Join Date: Dec 2011
Location: 33S 150E (AU holiday)
Posts: 1,181
Well, seven single 8m mirrors making a 24m composite mirror are much more difficult than 984 1.4m hexagonal segments making a 39m composite main mirror which makes the E-ELT on Cerro Armazones, Chile.
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