My daughter has a school project on Space and is looking for some facts about the Big Bang.

The Big Bang is the scientific theory that describes the origin of the universe . According to this theory , the universe began as an extremely hot and dense state , and has been expand ing and cool ing down ever since . This expansion is still occurr ing today , and is the reason why the universe is so large . The Big Bang theory is supported by a wide range of scientific evidence , including the cos mic mic row ave background radiation , the abund ance of light elements , and the large - scale structure of the universe . </s>