what does it mean when people say the universe is flat?
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A simplification of the other comments:
If you held a laser perfectly parallel to the ground, and there were no trees or mountains or buildings in the way, that laser beam would eventually go off into space, right? Because the Earth is round but the laser beam is perfectly straight, so the beam would keep going rather than follow the curve of the Earth.
As far as we can tell, there’s no such “curve” to the universe as a whole. If our laser beam kept going through space, it wouldn’t eventually go off into… outside-the-universe.
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