Half of these "parameters" are either: A. Absolutely not rare whatsoever, which makes your inclusion of them as astounding "parameters" completely moot. Or: B. Completely irrelevant to a system's ability to safely harbor life Furthermore, all that you did was list an enormous amount of astronomical terms, each of which can have direct affect (Or, in some cases, none at all) on various end results such as the composition and development of things completely uninteresting or philosophically dull. I could easily put up a just-as, if not more, lengthy list of concepts and say "Hey, if none of [i]these[/i] things happened, this [b]rock[/b] wouldn't be the same color!"