Light is a type of energy called an electromagnetic wave. This means that it travels through the atmosphere in these waves, which normally can only go in a straight line. It can only change direction via reflection or refraction but not of it's own accord. Light travels very rapidly, one wave could circle the globe 7.5 times in a second.
Light travels as electromagnetic waves that can move through a vacuum at a speed of about 300,000 kilometers per second. It travels in straight lines but can change direction through reflection and refraction. Light has a dual nature, acting as both a wave and a particle called a photon.
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