Quote:
Originally Posted by AGarvin
I guess it depends on how you look at it. The Lorentz factor itself goes up to infinity, not down to zero, as you approach the speed of light.
Absolutely.
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True, however when you try to get the sqrt of 0 (the result of solving the LT for a photon) and you get an undefined answer, that indefinite answer is in itself an infinity and might as well be zero. The equations are renormalised to rid the infinity from the result.