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Lecture 6

HISTORY 2720 Lecture 6: Lesson 6 - Stars
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3 Pages
81 Views
Spring 2018

Department
History
Course Code
HISTORY 2720
Professor
Samuel White
Lecture
6

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Everything was uniform and simple in the beginning, same temp and look
Lots of matter
Gravity - more powerful when stuff is closer/denser
Tiny differences in distribution of matter (1/1000000 of a degree difference in
temperature)
Complex things happen when you have perfect Goldilocks conditions:
Gravity continued to bring these tiny differences closer together, causing heat and
energy to be formed by the bumping atoms
Part 1
Universe is cooling down, suddenly heating up for first time. ~3,000 degrees atoms can
hold together. Creates plasma that raises to ~10,000,000 degrees. Nuclear fusion
causes stars to light up. Threshold 2
Stars: protons at extremely high temps. Photons work through surrounding
plasma to provide a light
Superclusters: webs and chains of clusters. At this scale, you can see the
superclusters moving farther away from each other. Galaxy doesn't hold these
together - we're expanding
Clusters: group of galaxies
Now we're filled with stars that are still being born in star nurseries. Provided us with
new structures
These stars provide us with 'campfires in Antarctica' that have goldilocks conditions
around them
Part 2
Big History Project - How were stars formed?
A: the stars!
Stars heating up cooked up the elements of the universe
Surface of sun ~5,800 degrees. Core ~15,000,000 40,000x hotter than boiling water.
Hydrogen protons heated to form helium. Carbon has 6 protons so it needs more heat.
Each element higher needs more tempertaure.
Q: Where did all the element come from?
A: In dying stars
Most of their life they are fusing hydrogen to helium. The collapse of gravity creates a
lot of pressure as they are bigger.
200,000,000 billion degrees creates carbon. This is the temperature once stars run out
of hydrogen. Then they burn through the helium. That's when it stars moving much
faster.
Q: Where does it get 3 billion degrees?
Big History Project - What did Stars give us?
Fusing carbon to neon -> oxygen -> silicon -> iron at 3,000,000 billion degrees.
At iron all the elements scatter into the universe
A: Exploding stars
Large stars filled with iron explode in supernova - all the elements are created. For a
few weeks they shine brighter than whole galaxies.
Leaves a big dust cloud of all the elements drifting away
Q: Where do the rest (after iron_ come from?
Part 2
Lesson 6
Wednesday, January 24, 2018 10:58 AM
New Section 1 Page 1

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Description
Lesson 6 Wednesday, January 24, 2018 10:58 AM Big History Project How were stars formed? Part 1 Everything was uniform and simple in the beginning, same temp and look Complex things happen when you have perfect Goldilocks conditions: Lots of matter Gravity more powerful when stuff is closerdenser Tiny differences in distribution of matter (11000000 of a degree difference in temperature) Gravity continued to bring these tiny differences closer together, causing heat and energy to be formed by the bumping atoms Part 2 Universe is cooling down, suddenly heating up for first time. ~3,000 degrees atoms can hold together. Creates plasma that raises to ~10,000,000 degrees. Nuclear fusion causes stars to light up. Threshold 2 Now were filled with stars that are still being born in star nurseries. Provided us with new structures Stars: protons at extremely high temps. Photons work through surrounding plasma to provide a light Superclusters: webs and chains of clusters. At this scale, you can see the superclusters moving farther away from each other. Galaxy doesnt hold these together were expanding Clusters: group of galaxies These stars provide us with campfires in Antarctica that have goldilocks conditions around them Big History Project What did Stars give us? Q: Where did all the element come from? A: the stars! Stars heating up cooked up the elements of the universe Surface of sun ~5,800 degrees. Core ~15,000,000 40,000x hotter than boiling water. Hydrogen protons heated to form helium. Carbon has 6 protons so it needs more heat. Each element higher needs more tempertaure. Q: Where does it get 3 billion degrees? A: In dying stars Most of their life they are fusing hydrogen to helium. The collapse of gravity creates a lot of pressure as they are bigger. 200,000,000 billion degrees creates carbon. This is the temperature once stars run out of hydrogen. Then they burn through the helium. Thats when it stars moving much faster. Part 2 Fusing carbon to neon > oxygen > silicon > iron at 3,000,000 billion degrees. At iron all the elements scatter into the universe Q: Where do the rest (after iron_ come from? A: Exploding stars Large stars filled with iron explode in supernova all the elements are created. For a few weeks they shine brighter than whole galaxies. Leaves a big dust cloud of all the elements drifting away
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