Guest: Irene Schneider returned to The Space Show for this program to discuss the Phoenix Lander on Mars, radiation, and Martian astrobiology including the search for present and/or past microbial life on Mars. Our discussion with Irene covered many topics as we took a close look at the ongoing search for microbial life on Mars, how it is being carried out, and what the chances are for finding such life on Mars. We talked about the harsh environment and noted that even here on Earth life can exist in extremes, even in high radiation, so why not on Mars?