宇う宙ちゅう大だい爆ばく発はつ

noun

Big Bang

Refers to the cosmological theory of the universe's origin from a primordial explosion.

• 宇う宙ちゅう大だい爆ばく発はつは約やく138ひゃくさんじゅうはち億おく年ねん前まえに起おこったと考かんがえられている。

  The Big Bang is thought to have occurred about 13.8 billion years ago.