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by markmark
Mon Jun 05, 2006 1:58 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Gamma Ray Earth !! ...? (APOD 03Jun06)
Replies: 7
Views: 3210

question

I understand why the atmosphere shows the preponderance of gamma rays, but, why do they show up primarily on the perimeter of the image? The whole of the image is covered with atmosphere.