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Cherenkov Radiation I recommend removing the Cherenkov Radiation comment from the reference to...
Blue Marble calendar 2.png | edit Description "The Blue Marble" calendar seen around Black Mesa...
Blue Marble pd.jpg | edit Description "The Blue Marble". Source Public Domain Images Licensing...
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|current||11:18, May 22, 2012||64 × 96 (7 KB)||Adapool||Adding image from http://combineoverwiki.net/w/index.php?title=File:Blue_Marble_calendar_original.png, as this appears to be the original image|