unlocked puzzles of science

 Dark matter Roughly 80% of the mass of the universe is made up of material that scientists cannot directly observe , known as dark matter. This bizarre ingredient does not emit light or energy. Since atleast the 1920s , astronomers have hypothesised that the universe contains more matter than seen by the naked eyes. Support for dark matter has grown since then, and although no solid direct evidence of dark matter has been detected, there have been strong possibilities in recent years. Originally known as the , "missing mass", dark matter's existence was first inferred by Swiss American astronomer Fritz Zwicky, who in 1933 discovered that the mass of all the stars , in the coma cluster of galaxies provided only about 1% of the mass needed to keep the galaxies from escaping the cluster's gravitational pull. Two varieties of dark matter have been found to exist. The first variety is about 4.5% of the universe and is made of the familiar baryons. Most of the baryonic or

Introduction   The world as we know it has three dimensions of space - length,width  and  depth  and one dimension of time.  But there's the mind - bending possibility that many more dimensions exist out there. Beyond these three visible dimensions, scientists believe that there may be many more. The development of string theory in early 1988 from studies of the problem of supersymmetry breaking by Antoniadis et al. In fact ,the theoretical framework of superstring theory posits that the universe exists in ten different dimensions. These different aspects are what govern the universe, the fundamental forces of nature and all the elementary particles contained within. Theories that suggest extra dimensions predict that,in the same way as atoms have a low - energy ground state and excited high - energy states, there would be heavier versions of standard particles called Kaluza - Klein States , would have exactly the same properties as standard particles but with a great mass. Kaluza