May 12 Could We Be Living In A 5-Dimensional Universe? Categories: General Relativity, Particle Physics Tags: 3-Dimensions, 4-Dimensions, 5-Dimensions, dark energy, dark matter, gravity as a dimension, particle theory, physics Posted by: Christopher Binns Comments:2 Do the dimensions of length, width, height and time explain our universe sufficiently? Maybe not. Could we be living in a 5-Dimensional universe where gravity is the 5th dimension. Sounds crazy but it explains dark matter and the elusive Graviton.