Week 5: Review Post

 What did you learn in lab this week? 

This week in lab we shared our presentations. My group did ours over Galaxies. We also took notes over the other groups presentations. This is all we did this week so we got out an hour early. 

What did you learn in discussion this week? 

Stars: 

  • Light did not happen until roughly 300,000 years AFTER the big bang. 

  • Stars and galaxies began to form 12.7 billion years ago. 

  • The sun formed from a stellar nebula (dust and debris) most likely from a star that went through a supernova. 

  • Our sun is 4.65 billion years old and is half way through its full supply. 

  • Average stars turn into Red Giants. 

  • Red Giants burn fuel and lose mass which increases its size due to less mass (gravity decreases)

  • Nuclear fusion- stars can only fuse atoms up to Iron on the periodic table of elements. 

  • When a star goes supernova that is where the rest of the elements came from. So, we know that there must have been another sun that went supernova. 

Meteors and Meteorites: 

  • Meteor: streak of light seen where a meteoroid heats up in the atmosphere 

  • Comet: icy body that releases gases as it orbits the sun 

  • Asteroid: rocky body smaller than a planet that orbits the sun 

  • Meteoroid: rocky or metallic fragment of a comet, asteroid, or a planet

  • Meteorite: meteor fragment that reaches the ground

Galaxies:

  • We live in the Milky Way, on Orion’s arm, in a spiral galaxy 

  • Three primary shapes: spiral, elliptical, and irregular 

  • Each galaxies contain approx. 200 billion stars 

  • There are over 2 trillion galaxies 

  • Galaxies have super massive black holes in the center- provides the gravitational pull that holds it all together. 

Black Holes: 

  • Super dense 

  • Nothing, including light, can escape 

  • Center of galaxies 

Inner/Outer Planets: 

Inner Planets: 

  • Mercury, Venus, Earth, Mars. 

  • Terrestrial/rock 

  • Three moons total (Earth has 1, Mars has 2) 

Outer Planets: 

  • Jupiter, Saturn, Uranus, Neptune

  • Gas/Ice (methane not H2) 

  • 143 known moons 

  • Many rings


Online Chapter:
What did you learn?
I learned more in-depth about the life cycle of stars, and meteors and meteorites, the asteroid belt, galaxies, and black holes. The most interesting thing I learned from this chapter was the in-depth information about each of the planets in our solar system. I really thought it was interesting the differences between the inner planets vs the outer planets.
What was most helpful?
I would say what was most helpful was the photo model of the life cycle of stars which we also saw during lecture. This is something I did not feel very confident in after listening to my peers presentation as this is something I was just not very familiar with, but after learning more in lecture and in this chapter I feel much more confident in myself and this topic.
What questions, comments/concerns do you have?
I would say that the only question I have right now is about the phases of the moon, I am wondering if every planet that has moons goes through phases too?

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