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A composite image of the Crab Nebula showing the X-ray (blue), and optical (red) images superimposed. The size of the X-ray image is smaller because the higher energy X-ray emitting electrons radiate away their energy more quickly than the lower energy optically emitting electrons as they move.
source: http://hubblesite.org/newscenter/newsdesk/archive/releases/2002/24/image/a
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