4 ms·

Isn’t mass the 4th dimension?

• rbanffy 5y ago
  It deforms spacetime, but I remember reading the other day that the deformation can be permanent. For a layperson (me) that looks like a plausible idea for what dark matter could be - space that's permanently deformed, but there's nothing there to collide with.
• nomel 5y ago
  I'm referring to plain old four dimensional space [1], which is just 3d space with another orthogonal axis. Same as 3d is to 2d space. If a creature existed in a 2d world, say on a piece of paper, they would never perceive another 2d world, another piece of paper, one inch above theirs, in the direction of the third third dimension. The same rules apply for two 3d spaces separated by a distance in the fourth dimension. The thought was that gravity bleeds through this higher-dimensional separation. 1. https://en.wikipedia.org/wiki/Four-dimensional_space https://en.wikipedia.org/wiki/Four-dimensional_space