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A physical theory which aims to be a consistent model
for the observable physical phenomena should at the first place
successfully explain already known physical laws,
but it should also predict new, yet unrecognised
features and phenomena. So far we are aware of four
fundamental interactions in the nature -- weak, strong,
electromagnetic and gravitational. Among them, only
the gravitational interaction is universal, and every
physical event is either directly or indirectly
influenced by it.
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History of science has noticed various theories
of gravity, but only few have overcome the crucial
criteria required for a correct physical theory.
Between them, the Einstein's relativity is widely
believed to be most consistent classical gravity
theory because of its logical simplicity,
geometrical elegance and physical transparency. The
accuracy of the general relativity has been many times
confirmed by most precise experimental equipment.
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