Internal physics links:

- Many pages simulating gravitational interactions:
- Klemperer Rosettes, very wierd but inherently stable orbits where many objects share the same orbit.
- Cruithne, Earth's second moon, an asteroid in a horseshoe orbit (a 1::1 resonance with Earth).
- Stable Figure-Eight Orbits, a figure eight orbit of three equal-weight bodies, originally discovered by Cristopher Moore, with these coordinates derived by Carles Simo
- Other orbits by Carles Simo: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24.
- Those same orbits, but running them longer to show any instability: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24.
- A three-dimensional 12-body orbit by Cristopher Moore and Michael Nauenberg, 2005, and a 4-body one too.
- Stable orbits around binary stars, showing some 2::1 and 3::1 resonances for inner planets of binary star systems.
- Noncolliding orbits that fill 3-space and keep neighbors next to neighbors.
- Dyson swarms, some built out of those noncolliding orbits above.
- Globular Cluster, just 200 random objects interacting gravitationally.
- Globular Cluster with Trails, same thing.
- Limits of the L4 Lagrange point
- Exploring Orbits with Java, answering most of the basic questions about orbits.
- A scale model of the solar system.
- Rings formed by a planet, a moon, and an asteroid in 5:3 resonance with the moon..
- Orbital applet documentation and source code.
- Math for orbit simulation: symmetric multistep methods for n-body simulations.

- Why there are no perpetual motion machines
- Designing the Dirigiped, a cross between a dirigible and a bicycle (which doesn't really work)
- Justine's roof rack box hoist, a little project with ropes and pulleys