theories of the origins of life ch.3 ppt. universe, solar system, and earth common accepted theory...
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UNIVERSE, SOLAR SYSTEM, AND EARTH Uneven distribution of matter combined with the gravitational attractions between molecules began to bring hydrogen and helium atoms together. As matter compounded onto of itself, (constantly increasing in density due to higher gravitational pull with greater masses) eventually it collapsed into itself, this is the process of formation for protostars (precursors to stars) If mass continues to compound, and the protostars density continues to increase, then its warm core will begin to heat up constantly due to contraction until pressure and density ignite the nuclear reactions required for atomic fusion.