There are stars and galaxies and whatever space objects everywhere we look weither it’s up, down, left or right. Yet, scientists say that the universe is flat? How?
In: Physics
A flat spacetime has three spatial dimensions at right angles to each other. Spacetime around here is flat. If it were curved, you could travel far enough in one direction to return to your starting point. The Earth surface is 2D, and not flat. It seems flat, if you’re in a parking lot, but if you go East far enough you will get back to where you started.
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