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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
 |
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):
Wikipedia for Schools was collected by SOS Childrens Villages. SOS Childrens Villages is a global charity founded in 1949 to give children who have lost everything the childhood they deserve. Help another child by taking out a sponsorship.