They said that the speed of light is the same for everybody, even if they travelled at 99% of the speed of light, if they turned on a torch the light would still travel ahead of them at the same speed as it would on Earth. He had Newton's laws, whch said the passage of time never changed for anybody, no matter what their speed and he had Maxwell's laws, which contradicted this. So if everybody moves through spacetime at the speed of light, then if we move faster through space alone, as we would in a rocket, to keep us at lightspeed through spacetime, we must slow down in time to balance the books and keep our speed through spacetime at lightspeed.Įinstein had two sets of laws in the late 1800s. The difficult bit (and possibly the wrong bit if I have misunderstood Relativity, or I am using outdated examples), is if you can imagine that our speed through spacetime is the speed of light, then most of this speed is travel through time (which we are used to as the normal passage of time) but a small bit of this speed is the speed we travel at through space, we do it every second as the Earth moves around the Sun. We know that we cannot travel ourselves at the speed of light through space, think just space for the moment.īut although the idea of travelling through time is just the ordinary passage of time, we have devised a system that measures how fast we travel through spacetime (all one word, not separate time or seperate space). I don't mean anything exotic when I say travel in time, I just mean that time passes for us in the normal way, it's 1 pm, 5 hours later it's 6 pm. We know, because we have tested it, that we live in a universe where travel in time and travel in space are linked by simple equations. The fastest velocity we know of is the speed of light. Your question about gravity is at the end of this attempt at an answer. I can possibly answer the why part of your question, based on these assumptions below.
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