IUPAC definition. polymerization: The process of converting a monomer or a mixture of monomers into a polymer. An example of alkene polymerization, in which each styrene monomer's double bond reforms as a single bond plus a bond to another styrene monomer.
There is evidence to indicate the Big Bang may have resulted from another, earlier universe collapsing in on itself, rather than from expanding from a point on infinitely hot and dense material. Instead, the universe appears to be going through constant phases of expansion (as it is at present) and contraction in a never-ending cycle. This theory of universe formation, known as the Big Bounce, was first proposed almost a century ago.
The big bang theory describes the creation of everything in the universe. According to this theory, all the matter in the universe came into existence at the same time during an event known as the big bang, which happened about 13.7 billion years ago. At that time, all matter was compacted into a single point with infinite density and intense heat called a singularity.