

In The Time Dilation Effect: The Speed of Light, narrator Kate Yule investigates Einstein’s observation that the speed of light doesn't follow the same laws as the speed of objects. Einstein suggested that time is relative and can speed up or slow down depending on movement. Learn how NASA tested this theory using twin astronauts. This video is excerpted from BBC’s Einstein & Hawking: Masters of Our Universe, a mind-bending documentary that tells the story of how the two most famous scientists of the 20th Century transformed our understanding of the Universe and changed the world.


In The Time Dilation Effect: The Speed of Light, narrator Kate Yule investigates Einstein’s observation that the speed of light doesn't follow the same laws as the speed of objects. Einstein suggested that time is relative and can speed up or slow down depending on movement. Learn how NASA tested this theory using twin astronauts. This video is excerpted from BBC’s Einstein & Hawking: Masters of Our Universe, a mind-bending documentary that tells the story of how the two most famous scientists of the 20th Century transformed our understanding of the Universe and changed the world.