93143 wrote:Jded wrote:Just a thought: do we take into account that movement (velocity) changes the light cone, so what constitutes the far-off distant mass also changes?
The "edge parts" that swap would be left with some net momentum.
I thought of that, but as I understand relativity, it doesn't actually work that way, because the speed of light is frame-independent and relativistic foreshortening is symmetric...
Anyone else have a different/better understanding?
It is symmetric (so moving forwards and backwards, with constant speed, is essentially the same), but if you change direction or speed, events may enter & exit the cone.
I don't have a good grasp of this stuff, but if the far-off distant mass is not constant, the effect seems to me a lot less magical.
BTW, could someone who understands the theory explain why exactly inertia seems to be constant in time with universe expanding?
As for the off-topic topic: IF someone higher up had since long ago good data on UFO's that was consistent with operation of Mach thruster, we would either:
A. never hear about Woodward's work, but see a lot more UFO's and substancial reduction in official military spending (why build f-22 or 35?) (extreme pointless conspiracy) or
B. all have Jetson's cars by now. Or at least see them officialy in the military.
Though it is not quite consistent. AFAIK there is no reason to think that Mach thruster would take away passenger's inertia (allowing arbitrary high acceleration)...