Lecture 18-1

1. ScienceCasts Did Earth Have Two Moons : click here
2. Moons : click here
3.Scientists research surface of the Titan moon : click here
4. Bill Nye Moon Cycle song : click here

If we had No Moon - P1. : click here
If we had No Moon - P2. : click here
If we had No Moon - P3. : click here
If we had No Moon - P4. : click here
If we had No Moon - P5. : click here

Lecture 18-2

1. Our Solar System - The 8 Planets : click here
2. Go For Launch! Space Shuttle The Time-Lapse Movie : click here
3. Mars Rover Update : click here
4. Why Pluto is Not a Planet : click here
5 Space School- Solar System : click here

Lecture 18-3

1. How are asteroids, comets and meteors different? click here
2.Rendezvous with a Comet : click here
3. meteors, asteroids, and comets : click here
4. Bill Nye: Comets: click here
5. Comets vs. Asteroids : click here
6.NASA JPL Apophis Asteroid Investigation : click here
7. What exploded over Russia? : click here
8. The difference between Meteoroids, Meteors, and Meteorites : click here
9. What are Meteors, Meteoroids, and Meteorites : click here
10.What Is the Definition of a Meteorite : click here
11. Bathroom in Space : click here
12. International Space Station Life : click here