The Description, Origin, and Development of the Universe

The progressive breaking of symmetry during the first minute of the Big Bang has been likened (analogous) to crystallization of a magma (igneous rock) by the process of differentiation. At some temperature (range), a crystal of a mineral with a certain composition precipitates out; if it can leave the fluid magma (crystal settling), the remaining magma has changed in composition. At a lower temperature, a second mineral species crystallizes, further altering the magma composition. When the last mineral species crystallizes, at still lower temperatures, the magma is now solidified. All the minerals that crystallized remain, each with its own composition. In the Big Bang, as temperatures fall, different fundamental particles become released, altering the energy state of the initial mix, as specific temperatures are reached (and at different times) until the final result is the appearance of all these particles, which as the Universe further expands and cools become bound in specific arrangements (e.g., neutrons and protons forming H and He nuclei; later picking up electrons to convert to atoms) that ultimately reorganize in stars, galaxies, and the inter- and intra-galactic medium of near empty space.

http://wgbis.ces.iisc.ernet.in/envisrs/?q=node/52/

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