ESS 101 Lecture 1 - ESS 101 Notes: Lecture 1 -Composition...

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ESS 101 Notes: Lecture 1 -Composition of the matter used to make up the universe is mostly hydrogen. -Planets are made up on stardust. -The matter is very dense, iron , nickel, silicon. These dense materials make up the planets. -Need supernova to create pressure to fuse lighter elements to make the denser ones. -Primordial dust makes up star material. -The sun and system of planets condense from a nebular dust cloud = Nebular hypothesis. -99% of nebular dust formed the sun. 1% formed the planets and other material in solar systems. -The nebular cloud was shaped like the typical spiral galaxy. -Pre-existing rotational component in the nebular dust cloud. -This dust cloud was made up of mostly hydrogen (99%), the rest was Helium and denser elements (Iron, Silicon, Oxygen, Magnesium) -We know the dust cloud is mostly hydrogen because we now see similar clouds today. -The sun has 75% hydrogen and 25% He, there is less Hydrogen in the sun because of fusion, the sun is constantly converting hydrogen to Helium.
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ESS 101 Lecture 1 - ESS 101 Notes: Lecture 1 -Composition...

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