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Our universe is flat, geometrically. But what exactly does "flat" mean?
12 December, 2016
This artist's impression shows how photons from the early universe are deflected by the gravitational lensing effect of massive cosmic structures as they travel across the universe. Image Credit: ESA
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NASA universe flat shape astrophysics cosmology topology David Schlegel Möbius strip Baryon Oscillation Spectroscopic Survey