Guest: Dr. Pal Brekke. Topics: Solar physics, astronomy, and his new book, "Our Explosive Sun." You are invited to comment, ask questions, and discuss the Space Show program/guest(s) on the Space Show blog, http://thespaceshow.wordpress.com. Comments, questions, and any discussion must be relevant and applicable to Space Show programming. Transcripts of Space Show programs are not permitted without prior written consent from The Space Show (even if for personal use) & are a violation of the Space Show copyright. We welcomed Dr.

Guest: Les Johnson. Topics: solar sail, space propulsion, interstellar space travel, environmental organizations. Les Johnson was our guest for this program for our discussion of solar sail technology and deployment, interstellar space travel and propulsion ideas, and the space advocacy community relationship with environmental organizations. Our first segment focused on solar sail technology and the efforts so far to have a successful solar sail demonstration flight.