The first 200 people to go to http://brilliant.org/minutephysics get 20% off a premium subscription to Brilliant. 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_paradox John Baez on Bell's Spaceship Paradox, Rindler Acceleration, etc https://math.ucr.edu/home/baez/physics/Relativity/SR/BellSpaceships/spaceship_puzzle.html Support MinutePhysics on Patreon! http://www.patreon.com/minutephysics Link to Patreon Supporters: http://www.minutephysics.com/supporters/ MinutePhysics is on twitter - @minutephysics And facebook - http://facebook.com/minutephysics Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute! Created by Henry Reich