What and where they are: a lot of moving about and risk
The areas discussed include:
| History | Titius-Bode Law; Development of ideas |
| What are they? | Not comets; Types C, S, and M; Vesta |
| Where are they? | Main asteroid belt; Trojans; Centaurs; Kuiper Belt; Scattered Disc |
| How did they form and get there? | Planetesimals; Collisions; Jupiter's gravity; Type Ds; The Grand Tack; The Nice Model |
| Orbital Effects | Trojans; Kirkwood Gaps; Hildas; Centaurs; Eccentricity and Inclination |
| Asteroid encounters | Galileo (Gaspra & Ida); NEAR-Shoemaker (Mathilde & Eros); Rosetta (Steins & Lutetia); Hayabusa (Itokawa) |
| NEOs risk | Spaceguard; Centaurs; Sources of large impactors |
| What can we do about it? | Divert it; Other solutions |