This is the unsolved mystery for every scientist who is working in unlocking the universe .the major set back in finding the answer is / so for v know is just a speck .without knowing every thing is just a theory of every intellectual aspects .every new year new theory come out eg string theory .recently v found out the higgs-boson u have to wait at-lest a century to get u r answer! what u seeking 4r ////▼♥☺