This video is about Bell’s Spaceship Paradox of Special Relativity, wherein a pair of rockets (or spacecraft) connected by a weak thread accelerate with uniform acceleration, maintaining the same separation, and the question is: does the thread break? And if so, why?
Interactive Spacetime Globe by Alexander Wu:
Read an overview on Wikipedia:
John Baez on Bell’s Spaceship Paradox, Rindler Acceleration, etc
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