n.(cosmology) the theory that the universe originated 20 billion years ago from the cataclysmic explosion of a small mass of matter at extremely high density and temperature
同义词：big bang theory
英汉双解大词典
big bang theory
1.
N-SING（单数型名词）
In astronomy the big bang theory is a theory that suggests that the universe was created as a result of an extremely large explosion. 大爆炸理论 ['the' N]