ESS 101 Lecture Notes - Lecture 1: Seismic Wave, Electromagnet, Silicate Minerals
15 Apr 2016
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Document Summary
Nebular hypothesis: stars and planetary systems formed in the universe are from nebular dust, nebula condensed into the sun and planets. Supernova and formation of primordial dust cloud --: condensation of primordial dust forms disk-shaped nebular cloud rotating counter- clockwise -> Proto-sun and planets begin to form -> Accretion of planetesimals and differentiation of planets and moons (4. 6 billion years old) -> Hydrogen (h: major elemental composition nebular dust. All other elements are much less lower in % composition. 99% of mass in the solar system. You need very high pressure to create dense objects (supernova) (h + he + other) Key principle in geology: the present is the key to the past. Planets and moons revolve in a counter-clockwise direction (not random) Almost all planets and moons rotate on their axis in a counter-clockwise direction. Planetary orbits are aligned along the sun"s equatorial plane (not randomly organized)
