Special & General Relativity Questions and Answers
Do any theories require more than 1 dimension of time?
None that I know of. One is enough. There may, however, be more than 3 dimensions to space, but that is only relevant to the sub-quantum world.
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All answers are provided by Dr. Sten Odenwald (Raytheon STX) for the NASA Astronomy Cafe, part of the NASA Education and Public Outreach program.