srron wrote:
Again, where did the chemicals and the heating,cooling, wetting agents and exploding stars come from?
It all starts from the most basic elements, hydrogen. All matter, above absolute zero degrees, moves constantly, and not in any discernible pattern. The big bang was uniform, up to a point. Then, for whatever reason acquired random movement, and the loose hydrogen atoms began to coalesce around each other. As this movement became more regular, clouds of hydrogen moved into orbits around each other, and as the number of atoms coalesced gravity increased. As gravity increased the orbiting hydrogen atoms heated. Eventually, over billions of years, the orbiting hydrogen atoms collapsed into stars (with "starlike" objects in the interim).
Over the next few billion years, the hydrogen at the center of the star went through a fusion process, creating helium, then lithium, etc. The burning goes on until a critical mass is created at the core, and then certain classes of stars explode when iron is formed. A different class of stars continues fusion until the natural limit of fusion results in the elements heavier than iron. Stars can either collapse or explode (supernova). And explosions blow elements into space, and those elements, over time, coalesce into dust and rocks. Somewhere around 4.6 billion years ago, enough gasses and rocks, etc. coalesced enough to create rocky or gaseous planets.
There! You now have 13 billion years of astrophysics wrapped up into a few paragraphs.
All kidding aside, it's been the study of space via Chandra, Webb, and Hubble telescopes, that we're learning more about our universe.
And one of the best sources of information about has been the Science Channel, and its various series on the Big Bang, how stars and planets are formed, and its done in language most folks can readily grasp. And the astronomers, astrophysicists, planetary biologists, etc. are very amiable off the air, also. I've sent emails to several of them, and they always responded with the amount of information I needed.