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 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Williamson, Mark |
Taille de l’image : | 3456 px × 5162 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |