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I was just wondering. Let's say the entire universe consisted of a rock in space, one rock just floating around, and then 'Poof!!', there's another peice of matter making it a total of two objects in the universe. It's a flashlight with batteries and it's switched on and pointing at the rock.Does the force of gravity between them instantly happen or does the light hit the rock first? Is gravity instant or is there a speed to it?
by the Mach principle, the sudden introduction of a large mass into the system is a bit of a problem. If it is introduced by some sort of energy transform then it would involve it's own huge flash and would take time. This would imply a low pass filtered step change. When would you start to notice the new arrival by its gravitational field.Is this scenario valid?
My thoughts are a bit of a jumble but doesn't Mach say that your mass and gravitational field rely on the existence of the rest of the Universe? That would involve some strange effect if another object were to be suddenly introduced into this universe.
I suggest that this additional object would have to result from the conversion of a lot of energy - some sort of mini-bang. The rate of energy to mass conversion would govern the rate at which the new mass could be created and the rate at which the gravitational fields could change (the time profile of the step change).I find these 'what if' questions very unsatisfactory because one can't tell how much of 'reality' needs to be part of the scenario and how much fantasy.
Please can I be excused now and go back to Newton's Laws? My brain has started to ache.