Philosophy v science: which can answer the big questions of life?
Philosopher Julian Baggini fears that, as we learn more and more about the universe, scientists are becoming increasingly determined to stamp their mark on other disciplines. Here, he challenges theoretical physicist Lawrence Krauss over 'mission creep' among his peers
"Let me give an example to put things in context. Astronomer Johannes Kepler claimed in 1595 to answer an important "why" question: why are there six planets? The answer, he believed, lay in the five Platonic solids whose faces can be composed of regular polygons – triangles, squares, etc – and which could be circumscribed by spheres whose size would increase as the number of faces increased. If these spheres then separated the orbits of the planets, he conjectured, perhaps their relative distances from the sun and their number could be understood as revealing, in a deep sense, the mind of God.
"Why" was then meaningful because its answer revealed purpose to the universe. Now, we understand the question is meaningless. We not only know there are not six planets, but moreover that our solar system is not unique, nor necessarily typical. The important question then becomes: "How does our solar system have the number of planets distributed as it does?" The answer to this question might shed light on the likelihood of finding life elsewhere in the universe, for example. Not only has "why" become "how" but "why" no longer has any useful meaning, given that it presumes purpose for which there is no evidence."
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