Guest: Dr. Donald Rapp was the guest for this Friday Space Show program. Dr. Rapp authored two new books, both of which were discussed on this program. During the first three-quarters of the show, we discussed his book, "Human Missions To Mars," and what it will take for humans to go to Mars. For the remaining part of the program, we discussed his book, "Assessing Climate Change," and here we facilitated an important discussion about the science behind climate change and global warming. Some listeners may find this to be a controversial show regarding both topics, so please be advised.