Eli5: Why does light travel so fast?
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Light travels fast because it is an electromagnetic wave, which means that it is made up of electric and magnetic fields that can propagate through empty space. Electromagnetic waves are able to travel at a very high speed, about 299,792,458 meters per second, which is the fastest speed possible in the universe. The reason why electromagnetic waves can travel at this speed is because they are not affected by the material through which they are traveling. In other words, they can move through empty space without any resistance or interference, allowing them to travel at their maximum speed.
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