Guest:  Dr. Jonathan McDowell;  Topics:  Space tourism, billionaires and space projects, space telescopes, commercial space, China and commercial space, The Space Report, competition, Blue Origin, Virgin Galactic, ULA, SpaceX and much more.

Guest:  Dr. Kelly Weinersmith; Topics:  Dr. Weinersmith' s upcoming book on the future of humans in space, space tourism, public and private sector issues and concerns, human factor spaceflight and settlement medical concerns, nuclear concerns, and much more.

Guests: John Batchelor, Leonard David, Dr. David Livingston.  Topics:  Suborbital tourism with Blue Origin and Virgin Galactic plus additional topics.  

Guests: John Batchelor, Doug Messier, Dr. David Livingston.  Topics:  Russian reusable boosters, the Orel crewed spaceship.  

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