| Title | Date published | ||
| Lecture 21: The Rotation and Revolution of the Earth | 2006-10-19 | ||
| Lecture 22: Light the Messenger | 2006-10-23 | ||
| Lecture 23: Worlds Within: Atoms | 2006-10-24 | ||
| Lecture 24: Matter and Light | 2006-10-25 | ||
| Lecture 25: Measuring Light - Spectroscopy | 2006-10-26 | ||
| Lecture 26: Telescopes | 2006-10-27 | ||
| Lecture 27: Deep Time - The Age of the Earth | 2006-10-30 | ||
| Lecture 28: Inside the Earth | 2006-10-31 | ||
| Lecture 29: The Earth's Atmosphere | 2006-11-01 | ||
| Lecture 30: The Moon | 2006-11-02 | ||
| Lecture 31: The Family of the Sun | 2006-11-06 | ||
| Lecture 32: The Origin of the Solar System | 2006-11-07 | ||
| Lecture 33: Battered Mercury | 2006-11-08 | ||
| Lecture 34: Venus Unveiled | 2006-11-09 | ||
| Lecture 35: The Deserts of Mars | 2006-11-13 | ||
| Lecture 36: Worlds in Comparison - The Terrestrial Planets | 2006-11-14 | ||
| Lecture 37: Jupiter and Saturn | 2006-11-15 | ||
| Lecture 38: Uranus and Neptune | 2006-11-16 | ||
| Lecture 39: The Moons of Jupiter | 2006-11-20 | ||
| Lecture 40: The Saturn System | 2006-11-21 |