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

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 space" means the same as "Euclidean space"<ref>

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 called also "3-space" in which any 3D sphere (called also "2-sphere" since its surface has only 2 dimensions) of surface area <math>4\pi r^2</math> contains volume of space <math>(4/3)\pi r^3</math>.

"Flat" or "Euclidean" means our regular (x,y,z) space called also "3-space" in which any 3D sphere (called also "2-sphere" since its surface has only 2 dimensions) of surface area <math>4\pi r^2</math> contains volume of space <math>(4/3)\pi r^3</math>.

</ref>) but is curved having certain [[curvature of space]] and the time reflects faithfully this [[curvature of space]] through the gravitational [[time dilation]] in such way that the whole ''spacetime'' is flat.  

</ref>) but is curved having certain [[curvature of space]] and the time reflects faithfully this [[curvature of space]] through the gravitational [[time dilation]] in such way that the whole ''spacetime'' is flat.  

This global flatness of spacetime is an important feature. without it the movement of certain geometrical structures (tensors) that describe things in space and time (therefore in 4 dimensions: 3 in space and 1 in time) wouldn't have the property of keeping the strict conservation of energy and momentum between the ''now'' and the ''past'' or the ''furture''. There wouldn't be any [[conservation law]]s valid in the universe. The things would be spontanously created from nothing and disappearing without trace from one moment to another just by the virtue of mathematical manipulation (as it happens in the [[Big Bang]] hypothesis in which spacetime is "curved") (luckily not in this universe of ours since then we would be forced to believe in "ghosts" while they would be created and disappear without no reason whatsoever). The creationist might be happy but the [[science]] wouldn't be as we know it today. Now in [[science]] neither energy nor momentum can't be created from nothing as it is assumed in the [[Big Bang]] hypothesis with its [[curvature of spacetime]]. [[Conservation law]]s assure that energy and momentum are conserved separately (not as some [[relativists]] think "together" as Wheeler's hypothetic "momenergy").

This global flatness of spacetime is an important feature. without it the movement of certain geometrical structures (tensors) that describe things in space and time (therefore in 4 dimensions: 3 in space and 1 in time) wouldn't have the property of keeping the strict conservation of energy and momentum between the ''now'' and the ''past'' or the ''furture''. There wouldn't be any [[conservation law]]s valid in the universe. The things would be spontanously created from nothing and disappearing without trace from one moment to another just by the virtue of mathematical manipulation (as it happens in the [[Big Bang]] hypothesis in which spacetime is "curved") (luckily not in this universe of ours since then we would be forced to believe in "ghosts" while they would be created and disappear without no reason whatsoever). The creationist might be happy but the [[science]] wouldn't be as we know it today. Now in [[science]] neither energy nor momentum can be created from nothing as it is assumed in the [[Big Bang]] hypothesis with its [[curvature of spacetime]]. [[Conservation law]]s assure that energy and momentum are conserved separately (not as some [[relativists]] think, "together" as Wheeler's hypothetic "momenergy" in which energy is assumed to be able to be converted into momentum and v.v).

This essay is meant to explain this strange physics of [[gravitation]], with which we deal every day but don't understand it, don't know how it operates and where the "gravitational force" is coming from, except for some physicists<ref>

This essay is meant to explain this strange physics of [[gravitation]], with which we deal every day but generally don't understand it, don't know how it operates and where the "gravitational force" is coming from, except for some physicists

<ref>

According to a legend only two of them Albert Einstein and Arthur Eddington, since when a journalist told Eddington that he heard that only three people in the entire world understand relativity, Eddington asked him "who is the third?"

According to the legend only two physicists, Albert Einstein and Arthur Eddington, understood relativity since when a journalist told Eddington that he heard that only three people in the whole world understood relativity, Eddington asked him: "Yeah? Who is the third?"

</ref>.  

</ref>.  

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.

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.

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>

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 [according to wikipedia]: ''"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."''

Quote from Newton [according to wikipedia]: ''"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."''

</ref>.  

</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?

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?