Thought Experiments


Video: 3 Things “Faster Than Light”

What, if anything, is faster than the speed of light? Einstein’s Special Relativity sets this universal speed limit, which no matter or information can surpass. But are there faster than light phenomena that evade this limitation?

This video explores 3 things that have been said to be “faster than light:”

  1. The expansion of the universe, and the speed of galaxies inside it
  2. Quantum entanglement
  3. The fastest possible cut through a piece of paper


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Greg Kestin

    Greg Kestin holds a faculty position at Harvard University, where he conducts theoretical physics research, teaches, and produces educational online content. He earned his physics Ph.D. from Harvard, as a member of The Center for the Fundamental Laws of Nature, focusing on theoretical particle physics and quantum field theory. Over his career, he has also conducted research in nuclear physics, fusion energy, and gravitational wave physics. For over a decade he has been involved with innovative educational outreach endeavors, bringing science to both students and members of the public through his writings, videos, lectures, and multimedia.