Guest: Dr. Christopher (Chris) McKay. Topics: Mars, astrobiology, planetary exploration, Moon bases, search for life. Please note that 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. We welcomed back Dr. Chris McKay of NASA Ames discuss Mars, lunar bases, the possibility of organics and even life on Mars, and humans to Mars missions.