how can the universe be flat if space is 3d?

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>>8509580
Think of a comic book. The book's pages are flat, even if you rip them in half. When you turn the next page, you are essentially determining the time rate of each event. The universe is essentially a different slide each and every time a Planck Length passes (smallest unit of time). If it were curved, the universe would be "curved" inwards as if you were pushing on a trampoline from the bottom. Things would rush faster outwards and would appear as if they were moving faster than the center.

A three dimensional system can only have one axis of rotation this gives it a flat shape

>>8509580

space is 4d

the extra d being time

>>8509580
because my d

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>>8509580
Physical space is a 3-dimensional manifold.

When we talk about the "shape" of physical space, we are talking about what space would look like if it were embedded in a 4-dimensional space. In the same way that we speak of a sphere being a two-dimensional manifold that can be visualized by embedding it in 3-dimensional space.

Brainlets aren't capable of perceiving 3-dimensional objects embedded in 4-dimensional space, however, so we have to "bring it down to their level" and use faulty analogies.

>>8509580
bup

>>8509664
>time dimension

kill yourself xD

>>8511210
read a book on relativity

>>8511210
>not knowing about four-vectors in space-time

>>8511215
>>8511216
Not him but I think he's probably referring to the fact that we don't if time is itself the 4th dimension. Could be the 11th... :^)

>>8511215
>>8511216
>>>/x/

>>8509580
3DPG