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.
Big Bang Theory The Big Bang is believed to have occurred between 10 and 15 billion years ago. (Most scientists agree that the universe is 13.7 billion years old.) Two elements, hydrogen and helium were created in the primordial fireball, along with small amounts of lithium and beryllium.