In relativity theory, fast moving clocks tick more slowly than slow moving ones. The effect increases as one approaches the speed of light. But what happens at the speed of light? Do photons experience time? In this video, Fermilab’s Dr. Don Lincoln lays out what we know about this interesting question.

Relativity: how people get time dilation wrong:
   • Relativity: how people get time dilat...  

Twin paradox: the real explanation:
   • Twin paradox: the real explanation  

Twin paradox: the real explanation (no math):
   • Twin paradox: the real explanation (n...  

Relativity's key concept: Lorentz gamma:
   • Relativity's key concept: Lorentz gamma  

Length contraction: the real explanation:
   • Length contraction: the real explanation  

Fermilab physics 101:
https://www.fnal.gov/pub/science/part...

Fermilab home page:
https://fnal.gov