LIGHT
Light is always thought as a form of matter before and just made of particles a long time ago, but then scientists discovered that light is actually a wave, specifically a type of electromagnetic wave. Basically, it is made of photon particles that behave like waves and known as the wave-particle duality.
SPEED OF LIGHT
Light is considered as a universal constant and the fastest thing in the universe, it travels at approximately 300,000 kilometers per second in a vacuum of space.
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