Special & General Relativity Questions and Answers
Is space-time orientable?
There is no evidence for this...certainly not within our own space-time. Whether it is orientable in some larger space/time we do not know how to confirm or disprove this because all that we can ever experience is within our space-time only.
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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.