The theory of 4-dimensional space time is in my opinion has the deepest implications and meanings. Everything denied by most rational human beings being proved to be true by this theory for example fate and destiny many of us would like to believe that our fate , our future is not fixed but this theory of a 4-dimensional spacetime implies that our future is not only fixed but is already existant , the very instant we see that space and time inter link to form something much more elegent and beautiful which also happens to be the nature of true reality, we also understand for sure that the past , the present , the future are of equal meaning . But I am not writing this post about the implication of the spacetime theory on time but to explain gravity through this model of reality called spacetime.
it as an experimental fact that gravitational forces influence time . for example i will write about an experiment , now it is in common knowledge that gravitational force acting on an object near the surface of the earth will be more than the gravitational force acting on the same object away from the surface of the earth . So two very precise atomic clocks were taken , these clocks were identical in every way mass , shape , size no aspect of one of the clocks differed from the other.Both of the clocks were started together one of the clocks was taken to a plane which travelled around the world once while the other was kept in laboratory . After the world tour of the other clock was over, they were brought to the laboratory and the time on the both the clocks was compared and it was found that the clock which stayed in the laboratory was a few billionths of a second behind the clock which took the world tour, this means that time near the surface is slower than time away from it.
In his general relativity Albert Einstein showed that mass and energy bend space time like a heavy ball kept on a trampoline ,(if we look at it from a 2-d point of view) but in from the 4-d spacetime if you remove time(one of the 4 dimentions) then this is what the earth (or anything for that matter) does to space(I am just using this sentence to explain ,space and time seperately have no meaning)
and as in the trampoline case everything follows those bends caused by the ball which we feel to be the force of gravity . Now you must all be thinking that "if gravity is not really a force so why do the planets revolve around the sun according to newton's first law (which works in all other cases), we need a force to move planets in circular path , it cant simply be wrong?" no it isn't wrong see, the different objects bend spacetime and a straight line in a curved spacetime is a curved line , thus the orbits of planets are actually straight lines in a spacetime zone which is curved. Thus no law is broken and gravity has been explained!!
Now as gravity is bending the spacetime and not just space we see the effect of time dilation , gravity is bending time itself(i am just using this sentence to explain the effects of time dilation , space and time seperately have no meaning). This effect is what is causing the atomic clocks to go at different rates.
it as an experimental fact that gravitational forces influence time . for example i will write about an experiment , now it is in common knowledge that gravitational force acting on an object near the surface of the earth will be more than the gravitational force acting on the same object away from the surface of the earth . So two very precise atomic clocks were taken , these clocks were identical in every way mass , shape , size no aspect of one of the clocks differed from the other.Both of the clocks were started together one of the clocks was taken to a plane which travelled around the world once while the other was kept in laboratory . After the world tour of the other clock was over, they were brought to the laboratory and the time on the both the clocks was compared and it was found that the clock which stayed in the laboratory was a few billionths of a second behind the clock which took the world tour, this means that time near the surface is slower than time away from it.
In his general relativity Albert Einstein showed that mass and energy bend space time like a heavy ball kept on a trampoline ,(if we look at it from a 2-d point of view) but in from the 4-d spacetime if you remove time(one of the 4 dimentions) then this is what the earth (or anything for that matter) does to space(I am just using this sentence to explain ,space and time seperately have no meaning)
and as in the trampoline case everything follows those bends caused by the ball which we feel to be the force of gravity . Now you must all be thinking that "if gravity is not really a force so why do the planets revolve around the sun according to newton's first law (which works in all other cases), we need a force to move planets in circular path , it cant simply be wrong?" no it isn't wrong see, the different objects bend spacetime and a straight line in a curved spacetime is a curved line , thus the orbits of planets are actually straight lines in a spacetime zone which is curved. Thus no law is broken and gravity has been explained!!
Now as gravity is bending the spacetime and not just space we see the effect of time dilation , gravity is bending time itself(i am just using this sentence to explain the effects of time dilation , space and time seperately have no meaning). This effect is what is causing the atomic clocks to go at different rates.
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