Birth of earth

Our universe came into being, most cosmologists agree， from 7 to ~ 15 billion years ago, in an initial "big bang” explosion that’s still expanding today.

Our home galaxy, the Milky Way， is estimated to be approximately 12 billion years old. Planet earth, the sun, and all the other planets，moons, asteroids, meteoroids, and comets of our solar system are believed to be relatively young in cosmic terms-from 4.5 to 5 billion years old Earth has a life expectancy of 12 billion years, that is, it has 7. 5 billion years before the sun explodes into a red giant that incinerates it.