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The Speed of Light

In Our Time

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The Speed of Light

Light plays a crucial role in our understanding of what the universe is and what it's doing. Could there be things going on in the universe that affects light on route to us? Or if we look at the way in which the light's formed at its source, could we learn something about what the world was like when the light left us? John Barrow: Has the speed of light changed since the beginning of the universe?

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