The speed of light (in a vacuum) is limited to 299.792.458 m/s. This sounds very fast, and it is on a global scale. But if you look at the Universe on a larger scale than it sounds quite slow, For instance it takes light from one and of the Milky way 100.000 years to get to the other end. So something is causing the light to travel at a speed of no more than this 299.792.458 m/s.
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