Quote:
Originally Posted by RoboMaster
It takes an increasing amount of energy to approach the speed of light, in a way that you would need an "infinite" amount of energy to travel at the speed of light.
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OK, so because E=ymC^2 (y being gamma), and because gamma approaches infinity as v approaches C, we end up where you need an infinite amount of energy to accelerate just past C.
As for Al's' thing with the flashlights, an observer standing still would see a solid beam of light, just hanging there in the air, like an infinite, glowing sausage.*
*Not really, but it's cool to think about that, no?