The Thaw Memorial Refractor at Allegheny Observatory,in Pittsburgh. The observatory was opened in 1859 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Science Source |
Taille de l’image : | 2806 px × 4153 px |
Model Release : | Non requis |
Property Release : | Disponible |
Restrictions : |
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