- Flux, Magnitudes and the Distance Ladderages 20 to 21 · on the way
- Hydrostatic Equilibrium and the Structure of a Starages 20 to 21 · on the way
- Energy Transport and Nuclear Burning in Starsages 20 to 22 · on the way
- Stellar Spectra, Spectral Classes and Surface Compositionages 20 to 21 · on the way
- The Hertzsprung-Russell Diagram and Stellar Evolutionages 21 to 22 · on the way
- General Relativity: Curved Spacetime and Its Testsages 21 to 22 · on the way
- Stellar Death: White Dwarfs, Neutron Stars and Black Holesages 21 to 22 · on the way
- Galaxies, Redshift and the Expanding Universeages 21 to 22 · on the way
- Galaxy Types, the Milky Way's Structure and Active Nucleiages 21 to 22 · on the way
- The Cosmic Microwave Background and the Light Elementsages 21 to 22 · on the way
- Dark Matter, Dark Energy and What the Universe Is Made Ofages 21 to 22 · on the way
- The Interstellar Medium and How Stars Formages 21 to 22 · on the way
- The Scale Factor, the Friedmann Equation and the Age of the Universeages 21 to 22 · on the way
- The Sun as a Star: Photosphere, Corona and the Activity Cycleages 21 to 22 · on the way
- Tensors and the Metric on a Curved Manifoldages 23 to 24 · on the way
- Parallel Transport, Christoffel Symbols and the Geodesic Equationages 23 to 24 · on the way
- Curvature and the Einstein Field Equationages 23 to 24 · on the way
- The Schwarzschild Solution: Orbits, Redshift and the Horizonages 23 to 24 · on the way
- Linearised Gravity and Gravitational Wavesages 23 to 24 · on the way