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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?).

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Last edited February 8, 2001 2:05 am by cobrand.bomis.com (diff)