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by lkadr
2612 days ago
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I remember Étienne Klein explaining that one of the theory why the universe is flat (if you take 3 galaxies and draw a triangle using them as points the sum of the angles will always be 180) is that we might be like an ant sitting on a ball. The ant only sees so much of the ball and from its perspective everything is flat. But in reality the ball is round. |
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