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
?).
![[Home]](wikipedia.png)