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So how fast is the speed of light? Well I am sure that many of you know, or knew in the past during those oh-so-fun years in physics class. The speed of light, c, in aproximately 300,000 KM/sec. Pretty darn fast. It is really amazing to me that light from the sun takse 8 minutes to reach earth. Here is an interesting website on this subject, What is the speed of light .com . It shows the many ways that the speed of light has been measured through the years until it became so accurate it became a constent that is used to measure the length of a meter (which was a less accurate known length then the speed of light!).