Assignment task:
Part I: Exercise to follow: Natl Geographic - Asteroids
1) What warning will we have of the next impact of a mile-size object?
2) What damage did the Tunguska fireball do?
3) List the evidence Dr Shoemaker found that meteor crater was due to impact?
4) What tore the Shoemaker-Levy 9 comet into pieces?
5) How often is Earth hit by an object that could kill billions of people?
6) How can we protect ourselves from impacts?
Part II:
1) What is the chief danger from space (top one)?
2) What is the main danger from outside the solar system?