According to reliability Anything that has a beginning has to end! The karma way. So the earth that had a beginning had to end. How then can we model this, we had been here form the day we thought of this. So Is it Weibull the generous one that can accommodate all is it! well what then would be its shape and life. Where exactly are we standing right now, Constant failure or Wear out phase. Well all that says that failure can happen any time. Earth can vanish any time - 26/12/2012. And then so are the other celestial objects. But neither the human life nor these global celestial bodies nor or the non made things. So this only applies for what all we made, so we must be surely able to predict them of the things that we have created.
Defining Reliable - the trust that we lay upon