Guest:  Robert (Bob) Zimmerman; Topics: Annual launch rates and predictions, China's Long March 5B, Mars rovers, ancient molecular life on Mars, light carbon atoms, life in the solar system, Carbon-12, UV light, Musk and Starship, Georgia's preliminary spaceport approval, exploring the lunar poles and more.

Guests: John Batchelor, Rob Godwin, Dr. David Livingston.  Topics:  Rob's book, "The Heritage and Legacy of the Space Odyssey, Fred Ordway, science fiction and today's reality plus more.   

Guest:  Dr. Casey Handmer; Topics:  SLS analysis, SpaceX, Starship & the SpaceX lunar lander, market and cost analysis, Blue Origin, space stations, Casey's blog, nuclear propulsion, Starlink and much more.

Guest:  Dr. Clive Neal; Topics:  Lunar exploration, lunar water, lunar prospecting, returning to the Moon, humans on the Moon, Mars, government policy, commercial space and making profits, space tourism and lots more.

We welcomed Doug Messier back to the program for a 94 minute discussion starting out with the success of the Perseverance Mars rover landing earlier in the day.  Most of the first segment was devoted to Perseverance, the various science experiments plans, the onboard hardware and instruments such as the helicopter, microphones, advanced cameras, MOXIE to make O2 out of the Martian atmosphere plus more.  Listen as Doug and callers/emailers discuss the instrument package, the experiments and the search for possible past life on Mars.  Also discussed was the landing site, Jezero Crater, plus t