20 Facts About the Light
1. Speed The speed of light in vacuum is around 300,000 kilometres per second (186,000 miles per second). 2. Variable Speed The speed of light is less than in vacuum when traveling through different transparent substances containing ordinary matter. For example the speed of light in water is about 3/4 of that in vacuum. 3. Sunlight Sunlight takes about 8 minutes and 17 seconds to travel the average distance from the surface of the Sun …