Chapter 11: The Sun Planetarium Extra Credit Chapter 11 Reading - - PowerPoint PPT Presentation

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Chapter 11: The Sun Planetarium Extra Credit Chapter 11 Reading - - PowerPoint PPT Presentation

Jan 25, 2023 158 likes •417 views

Chapter 11: The Sun Planetarium Extra Credit Chapter 11 Reading Assignment due today at 10:45am Opportunity! (see the syllabus) In-class/HW Assignment due Monday, October 15th (or today for +5pts bonus) Oct. 11th or 13th at 6:45 pm for the

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Fall 2018: Chapter 11 ASTR/PHYS 1060: The Universe

Chapter 11: The Sun

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Chapter 11 Reading Assignment due today at 10:45am In-class/HW Assignment due Monday, October 15th (or today for +5pts bonus) Are your grades in Canvas correct??? Planetarium Extra Credit Opportunity! (see the syllabus)

  • Oct. 11th or 13th at 6:45 pm

for the "Gateway to the Stars Program.” Free tickets available here, $2 otherwise

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Fall 2018: Chapter 11 ASTR/PHYS 1060: The Universe

Midterm 1 Results

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Fall 2018: Chapter 11 ASTR/PHYS 1060: The Universe

Multiple Choice Questions

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Fall 2018: Chapter 11 ASTR/PHYS 1060: The Universe

Kepler’s Law Short Answer Question

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8 AU Semi-major axis = 4 AU

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Fall 2018: Chapter 11 ASTR/PHYS 1060: The Universe

Why does the Sun shine?

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https://www.youtube.com/watch?v=3JdWlSF195Y

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Fall 2018: Chapter 11 ASTR/PHYS 1060: The Universe

A Small Correction…

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https://www.youtube.com/watch?v=sLkGSV9WDMA

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Fall 2018: Chapter 11 ASTR/PHYS 1060: The Universe

Sun Facts

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  • Diameter: 1.4 million km

(~100x Earth’s)

  • Mass: 2x1030 kg

(300,000x Earth’s)

  • Total Luminosity:

4x1026 Watts

  • Energy Reaching Earth:

1400 Watts/meter2

  • Surface Temperature:

5800 K

Solar Dynamics Observatory https://sdo.gsfc.nasa.gov The Sun on Wednesday

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Fall 2018: Chapter 11 ASTR/PHYS 1060: The Universe

The greatest pressure is experienced by the…

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A) Diver B) Mermaid C) Bathysphere D) Loch Ness Llama

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Fall 2018: Chapter 11 ASTR/PHYS 1060: The Universe

Hydrostatic Equilibrium

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Fall 2018: Chapter 11 ASTR/PHYS 1060: The Universe 10

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Fall 2018: Chapter 11 ASTR/PHYS 1060: The Universe

Pressure, Temperature, Density, Energy Produced all change with radius

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Fall 2018: Chapter 11 ASTR/PHYS 1060: The Universe

The Sun’s Luminosity Comes From:

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A) Chemical Burning (loss of electron energy) B) Nuclear Fusion C) Gravitational Collapse

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Fall 2018: Chapter 11 ASTR/PHYS 1060: The Universe

Fusion happens at the center of the sun because:

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A) High Temperature B) High Density C) High Density & Temperature

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Fall 2018: Chapter 11 ASTR/PHYS 1060: The Universe

Higher Temperature —> Faster Movement

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Cold Hot

High Density —> More likely to run into things

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Fall 2018: Chapter 11 ASTR/PHYS 1060: The Universe

Higher temperature makes collisions possible

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I n c r e a s i n g T e m p e r a t u r e Higher density makes it more likely for collisions to happen

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Fall 2018: Chapter 11 ASTR/PHYS 1060: The Universe

Hydrogen burning via the p-p chain

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Fall 2018: Chapter 11 ASTR/PHYS 1060: The Universe

Energy is conserved (and E=mc2), so…

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A) then 4 Hydrogen atoms must weigh more than

  • ne Helium atom

B) then 4 Hydrogen atoms must weigh less than

  • ne Helium atom
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Fall 2018: Chapter 11 ASTR/PHYS 1060: The Universe

Energy from Mass

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Fall 2018: Chapter 11 ASTR/PHYS 1060: The Universe 19

Photons are created in the core and move

  • utward to the surface
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Fall 2018: Chapter 11 ASTR/PHYS 1060: The Universe

How light escapes the Sun

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Fall 2018: Chapter 11 ASTR/PHYS 1060: The Universe

How light escapes the Sun

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https://www.youtube.com/watch?v=W_Scoj4HqCQ

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Fall 2018: Chapter 11 ASTR/PHYS 1060: The Universe

We learn about the Sun’s interior from “sunquakes”: helioseismology

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http://www.youtube.com/watch?v=YxUsr4vp3yM

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Fall 2018: Chapter 11 ASTR/PHYS 1060: The Universe

Zones of the Sun

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High Resolution Solar Spectrum

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Sun’s Atmosphere

Limb Darkening