Noctilucent clouds in a night sky over water. These frail,glistening clouds occur at night in areas of high latitude. They generally form at altitudes of around 80 kilometres,much higher than normal clouds. They may be composed of ice crystals or dust particles. Photographed in Finland | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / PEKKA PARVIAINEN |
Taille de l’image : | 5150 px × 3466 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |