M
Monkey1976
Guest
This I can definitely help with. We can take Fr. Lemaitre’s model of the Big Bang and use it to predict what elements would have been formed immediately following the primordial flash when God said, “Fiat lux” - this is the time of nucleogenesis, which lasted from when the universe was about .2 seconds old (not a typo - I really mean two tenths of a second) until it was nearly 17 minutes old. These primordial nuclides are almost 75% hydrogen, about 25% helium, with the fractional remaining percentage (accounting for the "about"s earlier) were a very small amount of lithium (including lithium-7, which cannot be produced through any known natural processes short of the conditions we can calculate were present during the time of nucleogenesis), and the tiniest smattering of beryllium.I’d be glad to review anything about the formation of heavy/radioactive elements - how any of the high atomic weight elements formed.
When the universe was about 10,000 years old, it had cooled enough that elements up to carbon could exist in stable form, though not yet in any great abundance, as conditions still weren’t right for stars to form. For anything heavier than carbon, we need stars - they are God’s furnaces, where metals are born. The current thinking is that the first stars appeared when the universe was about 700 to 750 million years old, and that they were supergiants - very large, very hot, and very short-lived - explaining why we don’t see any of these “Population III” stars today. It’s not the life of a star that makes heavy elements, but its death. As hydrogen fusion in the core proceeds, a layer of helium “ash” builds up at the center. Eventually, there is too little hydrogen to sustain the star the way it has been for most of its life, so it begins to collapse. This collapse increases pressure and heats up the core until the helium starts to undergo fusion. This cycle of burn->collapse->burn continues until one of two things happens: Either there isn’t enough matter in the star to sustain fusion of elements past a certain point and it collapses into a white dwarf, the outer layers being blown away by the last gasps of the stellar wind (the eventual fate of our Sun), or it keeps on fusing heavier and heavier elements, relying on diminishing returns until it - quite literally - hits a wall of iron.
For any star with a mass more than 8 times that of our Sun, this second path is followed, until it tries to fuse iron. Iron is the first element in the periodic table that takes more energy to fuse than is released from the fusion reaction. All of a sudden, the thermal pressure that has held the star in equilibrium is switched off. The outer layers - millions of kilometers in diameter - collapse inward upon the core in a matter of seconds, compressing it beyond all limits previously seen and forcing the fusion of heavier and heavier elements - this is the origin of all natural elements past iron - until “bouncing” off of the core in what we see as a supernova, leaving the core in one of two states. If the core itself is less than 1.44 times the mass of our Sun, then it is left as a neutron star - a giant atomic nucleus, about 20km in diameter. If it’s more massive than that, we get to the realm where our physics start to break down. We know of no physical force that can stop the collapse at that point, and so it keeps collapsing down and down until all of the core’s mass is concentrated into a point of absolutely zero size - a singularity - the heart of a black hole.
This is part of why I say that science reveals the glory of God: Look at your hand. Almost every single atom there was once at the heart of a star. Those that weren’t were formed in the fire that burned only at the beginning of time itself. These are the “dust of the earth” from which God formed us. For us, He set creation alight.
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