Unit 4: Other Stars and the Galaxy: Parallax Method. Astronomical Distance Scales (A.U., Light-Year, and Parsec). Hertzsprung-Russell Diagram. The Milky Way. Formation of Stars. Novae and Supernovae, Black Holes. Cepheid Variables.

2020-04-03. Slides: Distances to Nearby Stars and The Parallax Method. The A.U., The Parsec, and The Light-Year. Pages from Textbook Sections 19.1 and 19.2: The Parallax Method.
2020-04-06 to 2020-04-17: Spring Break, Review of Unit 3, and Unit 3 Exam.
2020-04-20: Slides: Hertzsprung-Russell Diagram — Discovered.
2020-04-22: Hertzsprung-Russell Diagram — Applied. Worksheets: Hertzsprung-Russell Diagram and The Milky Way Galaxy.
2020-04-24: Hertzsprung-Russell Diagram — Explained: I. Birth of Stars. Guest Lecture: Prof. Aaron Lee. Slides: Properties of Stars & Star Formation. Stefan-Boltzmann Law. Binary Star Systems. Star Formation from Interstellar Gas. Gravitational Contraction. Fusion Begins. Hydrostatic Equibrium. Star Enters Main Sequence.
2020-04-27: Hertzsprung-Russell Diagram — Explained: II. Death of Stars. Slides: Death of Stars. The Elements of the Solar System. Image: Planetary Nebulae. Image: Supernova Light Curve.
2020-04-29: Supernovae, Neutron Stars, Black Holes. Slides: Supernovae and Neutron Stars and Observation of a Black Hole. Veritasium YouTube Video: How to Understand the First-Ever Image of a Black Hole.
2020-05-01: Review of beginning of Unit 4 material. Review Worksheet: Distance from Absolute Magnitude. Start Unit 5. Cepheid Variable Stars.
2020-05-04: Unit 4 Exam. Unit 4 Exam Solution.