Special & General Relativity Questions and Answers
If I could put myself in the same point in spacetime where I was yesterday at noon, would it still be yesterday at noon?
Yes...but it would involve time travel and Nature doesn't seem to want to play that game with us.
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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.