On 9/8/2014 9:05 PM, Dave Dyer wrote:
Where is the energy coming from ? The amount of energy to accelerate the mass of a galaxy is trivial compared to the amount of energy tied up in the mass itself.
The kinetic energy of the galaxy depends on what you compare it to. It didn't start at zero and get accelerated, it started at the speed of light. So initially almost all it's energy was kinetic and the mass-energy was trivial. Only now it is 40Glyr from that stuff relative to which it's moving at the speed of light and it's among other stuff moving the same way, so it seems to be moving slowly compared to the speed-of-light. But, as Albert said, it's all relative. Brent Meeker
The bang was really big.
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