Eli5: Why does light travel so fast?
In: 130
Light has no mass and therefore no inertia. Light is a wave that by definition moves at light speed. In a vacuum, it moves at the fastest possible speed — light speed –because there’s no inertia or obstacles to slow it down.
In a sense, there’s no answer to the question “why.” That’s just what light is. It’s an electromagnetic wave that moves as fast it is possible to travel in a vacuum.
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