Is the fabric of space time 2d or 3d

  • Thread starter 6thgrader
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  • #1
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Well when I watch movies I see space time as 2d. But how do we see the space time from earth to a region lower than earth.
 

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  • #2
A.T.
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Well when I watch movies I see space time as 2d.
Space-time is 4D. But we cannot visualize this, so we usually just show a 2D slice, with the relevant dimensions.

But how do we see the space time from earth to a region lower than earth.
There is no "lower than earth" in space. All radial directions (away from the center) are the same. Space-time along the radial line looks locally like shown here:

https://www.youtube.com/watch?v=DdC0QN6f3G4

At a larger scale like this:
http://www.adamtoons.de/physics/gravitation.swf
 

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