Our guest is Mike Massimino. He is the veteran of two space shuttle missions, STS-109 on Columbia in March of 2002 and the STS -125 aboard Atlantis in May of 2009. Both were missions to service the Hubble Space Telescope and the final flight was the one that literally saved the Hubble so that it could make dramatic discoveries about the mysterious existence of Dark Energy and determine the age of the Universe itself. His memoir, Spaceman: an Astronaut’s Unlikely Journey to Unlock The Secrets of The Universe is out in print and on Audible.