CHEM 222 Chapter Notes - Chapter 4: Regolith, Nuclear Reactor, Outer Core

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The condensation of our sun and the accretion of the planets. The big bang created h, he, li, be, and little else. All the more massive nuclei were created in the nuclear fire of stars. From the dust of this nucleosynthesis, the elements of our earth were formed and from these our earth and sun and planets condensed. About 5 billion years ago (8 billion years after big bang), at some gravitational centre, material from the clouds of dust and gas left behind by supernoval explosions began to assemble the mass of our solar system. All elements known to exist in our solar system, except promethium (pm) pre- existed in this condensed cloud. All of the pm would have been quickly lost to the cloud, and the now cool cloud wasn"t hot enough to produce its replacement. These pro-planets were brought into orbit by angular momentum.