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Light travels supposedly in alternating electric and magnetic fields. By Maxwell's theory, this generates a wave that continues to propogate itself indefinetly. The speed of light is the only constant in the universe because of this property, and it is this property that unifies magnetism and electrostatics. Light can move so fast because it has no mass, and because it moves in the form of an electromagnetic wave. As a consequence, all electromagnetic waves move at the same "fast" speed, and this speed cannot be affected by the envornment in most circumstances.
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