Question: why are we on earth

Shikha Sharma answered on 11 Nov 2014:

Hi 328bera 39,
We are so lucky that out of uncountable objects in universe, earth has got environmental condition to sustain life in form of cells with nuclei and then evolution of life from bacteria to human being. That’s why we are on Earth. It took 1 billion years by earth to have 1st human. Since our universe is 14 billion years old, we really don’t know whether universe had one more or many more places in history which had life. We are yet to identify one.