Study finds single photons cannot exceed the speed of light

[zanejohnson]

it would take 3...

but then.. that would create new light.

 

[Born2bwire]

Sorry to burst your communist bubble, but Hong Kong actually operates via a capitalist service economy with the highest economic freedom index in the world.

:shiftyeyes:

??

The speed of light is said to be constant in all frames of reference, hence relativity and the Lorentz factor applies.

But he isn't wrong here. An observer can measure that the two objects are separating by a speed of greater than c because the individual objects still satisfy special relativity. That is, each object has a speed that is less than c but since they are both moving in opposite directions we can state that they are separating at a speed greater than c. Now from the perspective of one of the two objects that is speeding along, he will measure the other object moving away from him at a speed less than c due to the Lorentz transformation. So the objects are separating from each other at a rate greater than c (when observed by an observer that sees that each individual object still has a speed less than c) but the observers on these objects will always measure their rate of separation to be less than c.