Guest: Alan Boyle. Topics: Pluto, solar system planets, space tourism. Alan Boyle returned as a guest to discuss his new book, "The Case For Pluto: How A Little Planet Made A Big Difference." This book is available as an Amazon partner on the One Giant Leap Foundation (OGLF) website, www.amazon.com/dp/0470505443?tag=onegialeafou-20. If you order it from this OGLF Amazon link, Amazon makes a contribution to The Space Show/OGLF. During our first segment, Mr.