Cool Just How Fast Is The Speed Of Light In Context References. 300,000 kilometers per second (186,000 miles per second). With this speed, one can go around the globe more than 400,000 times in a minute!

The speed of light is 299,792,458 m/s in a vacuum. A scientist at nasa animated how long it takes light to travel around earth, as well as between. From galileo to today, how physicists have measured and modified the speed at which light travels.



