A core removed from a telescope mirror blank made from fused quartz. The bubbles visible in the core are formed as a result of the fusing process and do not effect the quality of the blank,the surface of which is ground,polished and aluminised before use. Photographed at Kitt Peak National Observatory,Arizona | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Williamson, Mark |
Bildgröße: | 3456 px × 5162 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |