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Originally Posted by gualbert
That is true on earth, but not in space/void, where there is no resistance at all.
How does this gain of mass works?
If a big ball of gold is sent orbiting around earth, will it grow bigger and bigger?
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it needs to be at "relativistic" speeds, meaning speeds close to the speed of light.
light/energy travels at around 186,000 miles a SECOND. That is haul-ass. and that is as measured in a perfect vaccuum, such as in deep space.
on earth, light travels slower due to the atmosphere or as uit enters water. these things bend light, slowing it down, just like very strong gravity from stars/galaxies/black holes can as well.