Changes

===Introduction===

===Introduction===

I'm writing this essay to explain to people interested in gravitation how it works according to Einsteinian physics. Between 1905 and 1915 the theory of gravitation switched from Newtonian math to Einsteinian physics and many Newton's problems got solved, mostly due to the fact that the space is not flat ("flat" means the same as "Euclidean") but is curved having certain [[curvatures of spacetime]] and besides, the time reflects faithfully these [[curvatures of spacetime]] through the gravitational [[time dilation]].

I'm writing this essay to explain to people interested in gravitation how it works according to Einsteinian physics.  

This essay is meant to explain this strange physics, with which we deal every day but, except for some, don't know how it operates and where the "gravitational force" is coming from. I hope it soon will be clear to the readers that gravitation contains no mystery and is probably the simplest physics around and could hardly work in a different manner.

Between 1905 and 1915 the theory of gravitation switched from Newtonian math to Einsteinian physics and many Newton's problems got solved, mostly due to the fact that the space is not flat ("flat space" means the same as "Euclidean space"<ref>"Flat" or "Euclidean" means our regular (x,y,z) space in which a sphere of surface area <math>4\pi r^3</math> contains volume of space <math>4\pi r^3/3</math>.</ref> but is curved having certain [[curvatures of spacetime]] and besides, the time reflects faithfully these [[curvatures of spacetime]] through the gravitational [[time dilation]].

There may be readers who might think that it should be left working as Newtonian math seemed to work when everybody and his brother thought that objects in the universe attract each other. Though it won't be true since gravitation doesn't work this way. Even according to Newton<ref>Quote from Newton: ''"That one body may act upon another at a distance through a vacuum without the mediation of anything else, by and through which their action and force may be conveyed from one another, is to me so great an absurdity that, I believe, no man who has in philosophic matters a competent faculty of thinking could ever fall into it."'' [after wikipedia]</ref>. Newton was wise man and didn't belive in things that he thought are impossible. Then there were many things seemingly impossible. Though gravitation was obviously possible. How did it work?

This essay is meant to explain this strange physics, with which we deal every day but, except for some people, don't know how it operates and where the "gravitational force" is coming from.  

The rest of introduction is to be provided later.

 

There may be readers who might think that it should be left working as Newtonian math seemed to work when everybody and his brother thought that objects in the universe attract each other. Though it won't be true since gravitation doesn't work this way. Even according to Newton<ref>Quote from Newton: ''"That one body may act upon another at a distance through a vacuum without the mediation of anything else, by and through which their action and force may be conveyed from one another, is to me so great an absurdity that, I believe, no man who has in philosophic matters a competent faculty of thinking could ever fall into it."'' [after wikipedia]</ref>.

 

 

The description of gravitation starts with the next section.

===Gravitational force===

===Gravitational force===