Earth formed around 4.54 billion years ago, approximately one-third the age of the universe, by accretion from the solar nebula. Volcanic outgassing probably created the primordial atmosphere and then the ocean, but the early atmosphere contained almost no oxygen.
For more info: https://en.m.wikipedia.org/wiki/History_of_Earth
Some people thought it was barbaric but some thought that they needed that to stop the war because the japan government was going to keep fighting until the whole country got destroyed
