• Question: what is the speed of darkness

    Asked by alfie11 to Ben, Dave, Ed, Sam, Susana on 25 Jun 2013. This question was also asked by charlie321.
    • Photo: Sam Horrell

      Sam Horrell answered on 25 Jun 2013:


      I don’ t think darkness has a speed. Darkness is just the absence of light so I don’t think it has a measurable speed.

    • Photo: David Briggs

      David Briggs answered on 25 Jun 2013:


      I don’t think dark has a speed, as dark is just “no-light”.

      If it did have a speed, it would be the speed of light.

    • Photo: Susana Teixeira

      Susana Teixeira answered on 25 Jun 2013:


      Darkness is the absence of light, so if you want to think of it as how fast does darkness reach you then it is as fast as light leaves. So the speed is c, the same as the speed of light.

    • Photo: Benjamin Hall

      Benjamin Hall answered on 26 Jun 2013:


      Darkness is just the absence of light so the speed at which light recedes is the speed at which darkness advances.

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