McDonald Observatory
| Title | McDonald Observatory |
| View | Astronomical Photographs 7 |
| Series | II: Buildings and Grounds |
| Description | The Ring Nebula in Lyra designated Messier 57 is a shell of glowing hydrogen and oxygen, which surrounds a central star of the 13th magnitude with a surface temperature roughly 70,000 degrees Celsius. The central star's ultraviolet radiation causes the shell's gases to glow. Photograph taken at the Cassegrain focus of the 82-inch McDonald telescope with a 5-minute exposure. |
| Subject Terms | Ring Nebula | Lyra (Constellation) | Stars | Satellites (Natural) | Astronomical photography |
| Photographer | Van Biesbroeck, George, 1880-1974 |
| Photograph Date | 1939-03-10 |
| Physical Format | Photographic prints; 4.7 x 4.0 cm |
| Collection | Archival Photographic Files |
| Repository | University of Chicago Library, Special Collections Research Center |
| Image Identifier | apf2-05109 |
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