Nothing supernatural, its just your camera trying to adapt to low light conditions, I notice your flash didn't fire in the second photo. This phenomenon is well documented and well understood in photography circles.
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Most orb photographs are taken with digital cameras under extremely low-light conditions and are nothing more than digital flaws caused by lack of pixelation or filling of the proper colors due to a digital defect. I have viewed thousands of such pictures and they are nothing paranormal, especially when taken with older digital cameras
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A little more information is available here:
http://www.ghostresearch.org/ghostpics/fake/orbs.html