Tesseract999

But could that be Becoz the force interfered with the mechanism of the clock ,but does that mean the 'time' actually slowed as such. And the idea that an astronaut travelling at near the speed of light does not age as quickly as people back on earth how is that possible?

But if time as is said a physical entity relative, according to Einstein then only can it be possible to affect changes on time. On the other hand if it's actually an independent entity then it's unchangeable right. Again is it Experimentally proven that time runs slower nearlarge gravitational fields? Or that too is just speculation?

Has this idea of time as a fourth dimension always been along or was this Einstein's contribution?

That means they are just theoretical meant only for better comprehension?

Is the more than 3 dimensions often discussed mere mathematical models or do they really eXist