(cosmology) the theory that the universe originated sometime between 10 billion and 20 billion years ago from the cataclysmic explosion of a small volume of matter at extremely high density and temperature
双语例句
A picture of the origin of the universe that has much in its favor is the big bang theory. 描绘宇宙起源最恰当的是大爆炸理论。
The Big Bang Theory implied that the Universe had a finite extent, an outside as well as an inside. 大爆炸理论指出宇宙具有有限的边界，有外部和内部之分。
