Earth Sciences 1086F/G Lecture Notes - Lecture 3: Milky Way, Orion Arm, Atomic Number
16 Jan 2020
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Chapter 3 - matter and the nebular hypothesis: the big bang created everything, at that supposed moment of singularity, any two points in space were so close together that density was infinite. Ion - an atom with either a negative charge or positive charge: positive ions usually combine with negative ions to form neutral compounds. Fission - a breakdown of the nucleus of a relatively heavy atom into at least 2 other lighter particles plus energy. Light to heavy: atomic number - number of protons in the nucleus of the atom. Condensation of the planetary disk: the sun was extremely hot, but it would not have made the whole nebula hot, there would have been a temperature gradient, the nebula would have had the same composition everywhere. Small pebbles accumulated into larger lumps - stones, boulders, and eventually, planetesimals (small planets) - about 10-100km across: collisions of planetesimals eventually created protoplanets, and then planets.
