What aspects of our world are arbitary?
By this, I mean something is "arbitrary" if having it the way it is wasn't necessary for life to develop and ask this question.
For example, it's probably not a coincidence that the one planet we know with life has such an exceptional moon:planet size ratio, because tides likely played a big role in the development of life.
But it is arbitrary that the moon perfectly eclipses the sun.
The radioactive parts of our periodic table are arbitrary; while their existence is necessary for Earth to maintain a molten core for billions of years, their specific properties could be randomised and you'd still end up with a bunch of heavy elements in the core with half lives of billions of years.
By this, I mean something is "arbitrary" if having it the way it is wasn't necessary for life to develop and ask this question.
For example, it's probably not a coincidence that the one planet we know with life has such an exceptional moon:planet size ratio, because tides likely played a big role in the development of life.
But it is arbitrary that the moon perfectly eclipses the sun.
The radioactive parts of our periodic table are arbitrary; while their existence is necessary for Earth to maintain a molten core for billions of years, their specific properties could be randomised and you'd still end up with a bunch of heavy elements in the core with half lives of billions of years.
