P2g Threats to Earth

You need to be able to:

• Explain how collisions can result in an Earth-Moon system, or in an asteroid belt
• Explain comets (structure, origin, orbit, speed)
• Discuss NEO's (what they are, how they may be seen, difficulties in observations, how trajectories are calculated, actions to reduce the threat)

1. Reading, exercises, flash cards and quizzes on comets
2. NASA's NEO project website
3. P2g notes from Bitesize
4.