how can we say that speed of light is very fast
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The speed of light in a vacuum is 186,282 miles per second (299,792 kilometers per second), and in theory nothing can travel faster than light. In miles per hour, light speed is, well, a lot: about 670,616,629 mph. If you could travel at the speed of light, you could go around the Earth 7.5 times in one second.
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Light travels at the speed of 2,99,792 km per second. It take the sunlight 8 minutes 20 seconds to reach the earth. Nothing can travel faster than light.
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