Kitt Peak National Observatory (KPNO) domes,Tucson,Arizona,USA,against stars in a night sky. With 23 telescopes,KPNO is the largest collection of astronomical instruments in the world,with two of them shown here. At right is the Mayall 4-metre telescope (completed in 1973) and at left is the Bok 2.3-metre telescope (opened in 1969 and operated by the Steward Observatory,University of Arizona) | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Tafreshi, Babak |
Bildgröße: | 2422 px × 3633 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |