We all have studied the concept of expanding universe. It is said that in the initial stage every matter in the universe was concentrated in a single dense cloud of matter. With the fusion reaction taking place and the pressure mounting up inside the core caused this dense matter to explode with tremendous push outwards.
These caused every particle to move outward and lead to the formation of current universe. This expansion of universe is proved by the Doppler study and also the galaxies repelling each other. Further study on the expansion concept reveals that expansion taking place from one single point.
Further researchers believe that the expansion has limit. The ever expanding universe at a point of time will start contracting. In this process the big player like stars will eat up the smaller bodies present. Over a period contraction will be completed and every particle merges to form the parent atom from which they evolved. Now the entire process repeats itself.
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