McDonald Observatory

McDonald Observatory

McDonald Observatory
Astronomical Photographs 7
II: Buildings and Grounds
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.
Ring Nebula | Lyra (Constellation) | Stars | Satellites (Natural) | Astronomical photography
Van Biesbroeck, George, 1880-1974
Photographic prints; 4.7 x 4.0 cm
Archival Photographic Files
University of Chicago Library, Special Collections Research Center

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