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Why we see stars when hit on the head

Have you ever hit your head and seen stars? It turns out that those pops of light have a name: phosphenes. They are a phenomenon characterized by seeing light without light actually entering the eye. A mechanical force such as a blow to the head or rubbing your eyes stimulates the cells of the retina causing this effect. http://www.omgfacts.com/Science/Those-stars-and-colours-you-see-when-you/2290

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