Question: How fast is speed of light?

Keywords: ,

  1. Good question. The speed of light is just under 300,000 kilometers per second. For reference, the earth is only 12,000 kilometers in diameter!


  2. The speed of light refers to the distance light can travel in a vacuum. It is exactly exactly 299,792,458 metres per second. REALLY fast!


  3. To give you some ideas about how fast that is, it takes light from the Sun about 8 minutes to reach us. The light from the nearest other star takes over 4 years to get here. And some of the stars we can see might have exploded 1000 years ago and we would not even know.



  1. (in one second, you could travel around the world 7 and half times!)