Wikipedia 10K Redux by Reagle from Starling archive. Bugs abound!!!

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Instrument composed of at least two LenS es or two MirroR s that increases the observed angular size of objects, as well as their BrightNess.
Used mainly on AstroNomy since GalileoGalilei.
The current generation of telescopes beeing constructed have a PrimaryMirror of between 6 and 8 meters of diameter (for GroundBasedTelescopes).