This note consists of Short Youtube Lecture Videos for each subtopic. Source: Andy Masley, IB Physics Teacher, 
https://andymasley.com/d-astrophysics/

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D1: Stellar Quantities

• Stellar Parallax
• Brightness and Luminosity of Stars

Equations Given in the IB Test Packet:

D2: Stellar Characteristics & Stellar Evolution

• Cepheid Variables
• Hertzsprung–Russell (HR) diagrams

​Equations Given in the IB Test Packet:

D3: Cosmology
Equations Given in the IB Test Packet:

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Background Pictures: ​http://www.physics.montana.edu/research/astrophysics/astro-msu.html