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World 7 · Special relativity: spacetime as a matrix · 9 min · PRO

The twin paradox

Proper time along two worldlines

PRO · Vector Lab

World 7: Special relativity: spacetime as a matrix is part of PRO

The first world of Vector Lab is free. PRO opens the other 21 lessons in 6 worlds — simulations, quizzes and all.

  • Light cones and the order of events
  • A moving clock runs slow
  • A moving rod is shorter
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← A moving rod is shorter

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