18. Search for Extraterrestrial Intelligence (March 13, 2008)

17. NASA, Past, Present and Future (March 11, 2008)

16. Exploration and Colonization of Mars - Why and How? (March 6, 2008)

15. Controlled Environmental Life Support (March 4, 2008)

14. Human Space Program: NASA, USSR, and Beyond (February 15, 2008)

13. NASA's Planetary Policy: History and Implementation (February 21, 2008)

12. The Search for Life on Titan, Europa, Enceladus and Beyond (February 19, 2008)

11. From the Ground Up: Suborbital Flight and Small Satellites (February 14, 2008)

10. The Search for Life on Mars (February 7, 2008)

9. When Worlds Collide: Extraterrestrial Threats to Life (February 5, 2008)

8. Replaying the Tape (January 31, 2008)

7. Life Beyond Earth/Panspermia (January 29, 2008)

6. Pushing the Envelope for Life; Environments for Life in the Universe (January 24, 2008)

5. Evolution of Life from Microbial to Multicellular (January 22, 2008)

4. From Non-Living to Living Matter (January 17, 2008)

3. From Interstellar Molecules to Astrobiology (January 15, 2008)

2. Stellar Evolution and Habitable Planets (January 10, 2008)

1. Astrobiology and Space Exploration: The Big Bang, Our Universe, and All That Jazz (January 8, 2008)