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The universe refers to the cosmos; all of space-time and that which exists as part of it. Alternatively, it can refer to the observable universe, which only contains the part we can see. Questions tagged with this should ask about physics at scales the size of the universe or specific properties of the universe

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Universe expansion acceleration

Now we observe the universe billions of years later - it seems only natural that the galaxies who traveled the furthest during this time are exactly those with largest initial velocities. …
Ofek Shilon's user avatar