[ExI] speed of light at the speed of light

BillK pharos at gmail.com
Thu Aug 22 12:27:53 UTC 2013

On Thu, Aug 22, 2013 at 12:29 PM, Gordon wrote:
> I am in a spaceship accelerating away from earth and approaching the speed
> of light. I have a flashlight. My instruments tell me that the light emitted
> from my flashlight travels at c. This is true no matter whether I shine it
> forward in the direction of my travel or backward toward the rear of the
> ship.
> I understand it is problematic to speak of massive objects actually
> travelling *at* c, but it seems me that *in the limit* as I approach c (as
> above), c is still a constant in my frame of reference. And how is this any
> different from saying that if my ship is travelling at c, the light from my
> flashlight still travels in my direction of travel at c relative to my
> flashlight?
> Am I missing anything here? This is not my area of expertise and I have some
> friends in another forum who think I am crazy.

This is an old question. Google will explain.
The same question worried Einstein, so he was forced to inven the
Theory of Relativity.


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