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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?

REFERENCES
Interactive Spacetime Globe by Alexander Wu:
https://alexonscience.com/projects/spacetimeglobe/


Read an overview on Wikipedia:
https://en.wikipedia.org/wiki/....Bell%27s_spaceship_p



John Baez on Bell's Spaceship Paradox, Rindler Acceleration, etc
https://math.ucr.edu/home/baez..../physics/Relativity/


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