Geol 102 - origins

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After big bang, universe was made up of ...

Zones of varying density of hydrogen, until most of the hydrogen is in very dense balls seperated by empty space.
Densifying _____ eventually becomes ____
- -hydrogen, stars
- -Densifying hydrogen continues until nuclear fusion stars. heat generated prevents further contraction. a star is born!
Even electron elements are favored over odd electron elements in stellar burning because...
- even + even = even
- odd + odd = even
odd + even = odd
Planet building elements are:

Carbon (C), oxygen (O), megnesium (Mg), silicon (Si), and iron (Fe). Favored during the advanced burning.
Normal vs. big stars

Normal - iron is heaviest element produced

Big stars - evolve rapidly and explode as supernovas. supernovas are the explosions in which all the elements heavier than iron are produced.
99.9% of the mass in the solar system is located...

in the sun!