Energy
Orbits Revisited
- Shapes and conic sections
- Energetics: bound vs unbound orbits
- Escape speed
The Two-Body Problem
- Center of mass
Testing Newton's Gravity
- source of Uranus orbit perturbations
- binary stars
- globular star clusters, e.g., 47 Tuc, Omega Cen
Geocentrism vs Heliocentrism: Lessons
