Week 8

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 Week 8 

New Lecture:

  • 13.7 billion years ago there was nothing and nowhere. The big bang occurred 13.7 billion years ago, earth was formed much later. 
  • We call it the big bang but nothing exploded, it was more of an expansion. Nothing became something.
Stars:
  • light did not happen until 300,000 years AFTER the Big Bang
  • Stars and Galaxies began to form about 12.7 billion years ago
  • The sun formed from a stellar nebula which is dust and debris, most likely from a star that underwent a supernova. 
  • The sun is 4.65 billion years old and is half way through its full supply
  • Red giants are huge and bur fuel and lose mass, which then increases size due to less mass
  • Nuclear Fusion- Stars can make up to iron on the periodic table of elements
  • Every element in our universe came from the explosion of a star
Origin of the Earth:
  • Created 4.65 billion years ago NOT IN THE BIG BANG
  • The big bang happened and it created a red giant. The red giant blew up and the Dust and debris created the earth which came from a former star that exploded
  • Sun gobbled up 99.84% of everything 
  • The plane of the Ecliptic created planets
  • the planets near the sun are composed of more dense matter, rocky, less gas. 
Black Holes:
  • Super dense
  • Nothing including light can escape
  • Center of galaxies


Lecture:

The moon is the size of the United States.

Crust, mantle, core. Core is made of iron that protects us from the sun that's why we see northern lights. The moon lacks heavy elements of iron that the earths core has. Thea, this planet the size of the moon collided with thea, the blow only cut into the crust and mantle. Materials combine together from the collision, the moons chemical makeup shows both elements of thea and the earth. That is why the earth is tilted on its axis.  

Fission Theory

The idea that the earth was spinning so fast, stuff ejected and formed the moon that dislodged to a moon size piece of earth in tis orbit

Co-formation:

Earth and the moon formed at the same time, this is hard because the moon does not have the same core as the earth. 

Colliding Planetesimals

This is the theory that earth collided with a different planet and created debris from both planets that formed to be the moon. 

When the early moon was formed it was molten and hot and so was the earth, because the moon stays facing the earth as it rotates, it took the side facing the earth longer to cool down. When two hot objects face each other itll take longer to cool down rather than the back of the moon which cooled down. 

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