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Space Ed

Einstein's twin paradox explained - Amber Stuver

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On their 20th birthday, identical twin astronauts volunteer for an experiment. Terra will remain on Earth, while Stella will board a spaceship. Stella’s ship will travel to visit a star that is 10 light-years away, then return to Earth. As they prepare to part ways, the twins wonder what will happen when they’re reunited. Who will be older? Amber Stuver investigates the “Twin Paradox.”

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Stella is traveling on her spaceship at a velocity that makes the distance between the Earth and the destination star appear 80% the distance that Terra measures on Earth. What speed does Terra measure Stella traveling at as a fraction of the speed of light, c?
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About Space Ed

Space Ed helps you untangle the mysteries of space with the universe’s best videos on everything from Einstein's theory of relativity to what it would take to live on Mars. Brush up on the science, philosophy and mystery of space, because the fabric of the universe is the same fabric that connects us all.

Meet The Creators

  • Director of Production Gerta Xhelo
  • Script Editor Alex Gendler
  • Editorial Producer Alex Rosenthal
  • Educator Amber L. Stuver
  • Associate Producer Bethany Cutmore-Scott
  • Fact-checker Brian Gutierrez
  • Sound Designer André Aires
  • Producer Tom Knight
  • Music AIM Creative Studios
  • Animation Mulligan Studio, Ricardo Coelho
  • Character Designer Rui Almeida
  • 3D Animator Hélder Vasconcelos
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