On Hume and the Problem of Induction
We take it for granted that the sun will always rise and set with the same regularity that we have known all our lives, but there is no logical reason why this assumption should always hold. What if one day the sun were to suddenly go out like a light turned off at a switch, or, (worse yet?) exploded in a supernova, taking all of the planets with it? We say to ourselves "the laws of physics do not permit such a thing to occur," yet this statement relies on the constancy of the laws of physics from moment to moment, a state of affairs which may have held throughout the past (and we cannot be certain that the laws of physics have always been what they are at present), but for which we have no reason to believe must hold in the future.
Contemplating the logical possibility of the sudden and unexpected death of our solar system puts a peculiar perspective on the significance of life on our planet. What would it mean if all life on our planet were suddenly to be snuffed out? What possible significance would there be to a universe without life within it? I hear you say "Wait! Who says that ours is the only planet bearing life?" I grant that you have a point, but I am not one of those who imagine that the existence of life elsewhere is so probable as to be a certainty. Besides which, there is a conceit behind such thinking that I wish to expose, a conceit that also lies behind my own line of reasoning, and it is namely this - there must be a meaning, a purpose embedded in the existence of our universe, and this purpose can only be to facilitate the existence of life. But why must this be so?
Indeed, it no more need be so than that the sun should continue to exist for another billion years. It is logically possible to imagine a universe without life, a vast and complex universe, coming into being, evolving and eventually perishing, either by collapsing in upon itself or subsiding into heat death, without the epiphenomenon called life having any part to play into it. To assume otherwise would be to imagine the universe to be a show somehow put on for our or someone else's entertainment, a spectacle which would be rendered pointless without spectators.
