What are natural facts?
These are mutable statements about the (physical) world (or the cosmos) or things in it that have become deep assumptions. They are accompanied by many generations and types of evidence. In order for them to be overturned, which is of course conceivable (because they are not universal, immutable truths), an enormous amount of equally-rigorous evidence would need to be presented. We call them natural because they describe or explain the physical world—the things that compose everything in the cosmos. We call them facts because they are unlikely to be overturned or seen in a contradictory light. What is more important, though:
These are statements upon which your opinion has no bearing: you are not offered the choice to believe in these statements or not, regardless of their inconvenience. Your third-party consent and subscription are not required in order for them to remain as natural facts.
What are some examples of natural facts?
(I) Human biological evolution: contemporary humankind was preceded by a vast range of similar species, all branching out from families of typically smaller and typically less-complex organisms. We are genetically related to every species of plant and animal life on this planet. Like the baboon and the butterly, we are animals.
(II) The planet Earth is confined to a medium-sized solar system with a medium-sized, middle-aged star in a medium-sized galaxy that contains billions of other stars and their systems. Most if not all of the physical material contained within individual solar systems expanded out from the centre of collapsed molecular clouds (also called ‘stellar nurseries’) and formed suns (the most dense, at the centre of this collapsed region) and eventually planets and other debris. All plant and animal life, if they are to be found in a given system, therefore, came to be because of a gravitational collapse.
(III) Physical conditions permit life. Where complex organic chemistry exists, we know that there must be appropriate thermodynamic and gravitational conditions. Favourable temperatures and pressures, for example, permit the aggregation of atoms into molecules, molecules into cells, and cells into organisms. Where life is, life could have been.
(IV) Favourable conditions are rare. The vast majority of the observed cosmos is completely inhospitable to organic chemistry. Most of what we see across the galaxy and beyond consists of horrific destruction and reformation. Our own galaxy is due to be destroyed in four billion years in a collision with a neighboring galaxy. Ultimately, life is rare, and therefore precious. Yet, with the billions of species that have already become extinct on this planet alone, life is evidently not sacred.