• Question: how do you know if you are travelling at the speed of light

    Asked by horsesrule123 to Hywel, Joseph, Poonam on 24 Jun 2010 in Categories: .
    • Photo: Joseph Cook

      Joseph Cook answered on 24 Jun 2010:

      Unfortunately things with mass cannot travel at the speed of light, so we know that we are not travelling at the speed of light. Speed is all relative though, so to determine your speed you would need to measure it relative to something else, which may or may not be moving. For example, cars on the motorway are travelling at 70 mph, but only releative to stationary objects and people by the side of the road.

    • Photo: Dr Hywel Jones

      Dr Hywel Jones answered on 24 Jun 2010:

      You look at the speedometer and see if it says 670616700mph!