SpeedrooHow slow has light ever been made to go?
38 mphAbout 61.2 km/h · Run
In 1999 Lene Hau's lab at Harvard slowed light to about 38 mph (17 m/s), the speed of a fast bicycle.
That's about 1.1 times a red kangaroo's top speed of about 35 mph (56 km/h).
💡38 mph
🏊a record 1,500 m swim
By speed: slowed light is about 9.9× faster than a record 1,500 m swim.
Things about as fast
- How fast can a giraffe run?37.3 mph
- How fast can a wolf run?37.3 mph
- How fast can a hyena run?37.3 mph
- How fast was the fastest lava flow?37.3 mph
- How fast was Secretariat?37.5 mph
- How fast was Blériot's Channel flight?37.9 mph
- How fast could an Iowa-class battleship go?37.9 mph
- At what wind speed does a gale begin?38.5 mph
Many real things vary, so we use a typical or official figure. Spotted a mistake? Email [email protected].