If he is right, Professor John Webb will go down in history for shaking the foundations of physics and perhaps solving the mystery of why we exist in this part of the universe. If he is wrong, there will be no shortage of sceptics saying they told him so.
The Sydney astronomer and his colleagues have made a radical find: that one of the fundamental constants of nature is not a constant. Not only does it appear to be changing, they have shown, it also differs depending on which direction in space you're facing.
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