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      Electromagnetic 
        waves reveals the mystery of gravitation 
 Isaac Newton discovered the law of attraction force between masses.
 The cause, the nature of such force, remains a mystery.
 It is find that some radio waves as well come back, like stones thrown 
        up.
 As radio photons have no mass, the phenomenon cannot be gravitational, 
        although, Einstein foreseen that a light ray passing
 
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        next to the sun, shall be gravitationally curved, without explaining the 
        interaction. 
 The conclusion, radio photons are reflected by the
 ionosphere.
 Photons occupy a range of wave lengths, from kilometers to nanometers.
 How does a photon reflects a 2Km wave length., a sphere where oscillation 
        preserves its parameters, by a rarefied gas?
 The FLUEN theory has a simple interpretation:
 Photons propagate in light speed in an electromagnetically polarized space 
        (centripetal force),
 
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      which 
        in return propagates as well with the light speed, but contrary.
 Depending on the wavelength (the volume of interaction), photons are braked,
 
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        the trajectory is curved to the change of propagation direction, like 
        comets or vertically thrown stones.
 Likewise, a ship launched to the periphery of the solar system shall come 
        back to the area of its launching.