Special & General Relativity Questions and Answers
What is the simplest evidence that there are more than 4 dimensions?
There is none. All of the 'evidence' is of the theoretical kind, but none of it has been put to the test because...we don't know how! All we know is that our space-time is 4 dimensional to about a few parts per hundred billion based on how well gravity follows 4-D general relativity inside our solar system.
Return to the Special & General Relativity Questions and Answers page.
All answers are provided by Dr. Sten Odenwald (Raytheon STX) for the NASA Astronomy Cafe, part of the NASA Education and Public Outreach program.