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            This is a file from the  Wikimedia Commons. Information from its  description page there is shown below.  Commons is a freely licensed media file repository.  You can help. 
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        Summary 
        
         
          
           | Description | 
           Gravitational red-shifting2.pngThis is a modified version of     namely a version that has been rotated by 90 degrees. The original image has the following description: Illustration for gravitational red-shifting. Picture created using Adobe Photoshop CS2.  
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           | Date | 
           1 July 2007 | 
          
          
           | Source | 
           Modified version of image that was already featured in Wikimedia Commons | 
          
          
           | Author | 
           Original image by  User:Vlad2i, slightly modified by  User:mapos. | 
          
         
         
         Licensing 
        
         
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          Permission is granted to copy, distribute and/or modify this document under the terms of the  GNU Free Documentation License, Version 1.2 or any later version published by the  Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled  GNU Free Documentation License.  http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue 
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       File usage
       
        The following pages on Schools Wikipedia link to this image (list may be incomplete):
        
        
       
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