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Recent observation of supernovae type Ia show clearly that there is a largescale repulsive force in the Universe. Neither of the four known fundamentalinteractions can account for this repulsive force. Gravity is known to be theinteraction responsible for the large scale structure and evolution of theUniverse. The problem with gravity is that it gives rise to a force which isattractive only. Gravity theories, including General Relativity, deals withgravity as an attractive force. Although this is consistent with our experiencein the solar system and other similar astrophysical systems, gravity theoriesfail to account for SN type Ia observation. So, we are in a real problemconcerning the interpretation of these observation. This problem is only tenyears old. In order to go out of this problematic situation, scientists havesuggested the existence of a type of energy in the Universe that is responsiblefor the above mentioned repulsive force. They have given this type of energythe exotic term {\it "Dark Energy"}. Although this type of energy forms morethan two thirds of the energetic contents of our Universe, its reasonablenature is missing in all gravity theories.  The aim of the present work is to review the present status of the problem ofdark energy. Also, to suggest a new geometric solution for this problem.

Dark Energy: A Missing Physical Ingredient