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Is the fabric of space time 2d or 3d

  1. Mar 12, 2014 #1
    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.
     
  2. jcsd
  3. Mar 12, 2014 #2

    A.T.

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    Space-time is 4D. But we cannot visualize this, so we usually just show a 2D slice, with the relevant dimensions.

    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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