The spherical object we currently inhabit, is perfectly situated in its orbitary location to foster life - the carbon based kind, all living organisms that dwell this globe, have. Without an argument, life on this sphere began very very tiny and very very long ago - 3.5 billion years. Today, without a doubt a cool 3.5 billion years later we ourselves also appear on the face of planet earth. An extensively elongated succession of eons with precision laws of physics and mathematical constants at play, is all it took. This sphere having been fully colonized, is our only home, now and till the day we will be no more - rest assured, we ain't going nowhere else.
Not only that. But also, the odds against life being able to come about on earth are approximately 1 to infinity. What this means is that, scientifically speaking, we don't have a clue as to why and how life can even exist.
If we go to Mars, we will be using a little science that we can figure out, and a whole bunch that exists around us already, but that we essentially know nothing about.
