Gravitation (the attractive force existing between any two objects present in the universe that have mass) refers to one of the four fundamental forces in physics that are responsible for the attraction between masses. The other three fundamental forces are strong nuclear power, weak nuclear power and electromagnetism. In comparison to these other three forces, gravitation is certainly the "odd" one. While there is one single theory called the "Grand Unified Theory" that describes the other three forces, gravitation is explained solely by Einstein's general theory of relativity.
According to that general theory of relativity, masses cause a distortion of the space-time structure around them. Any other mass that comes closer will experience the warping of space-time, and this appears to us as an attractive force between two masses.
We will reason that this view is the wrong side of the coin. By turning over that same coin, another possibility appears that has a much stronger argument and brings out the true nature of gravitation.
In that search, a number of fixed assumptions were reviewed and there, too, surprising new insights emerged. The phenomenon of the "spin" of elementary particles finally gets a plausible explanation, the reason for the expansion of the universe and the consequences involved showing a different reality, and the key in the lock of the Grand Unification theory has been turned, opening up a new dimension in physics.
Let us take a first step :
“ … Einstein himself believed that the theory of general relativity could not properly function without a medium … “
