We had the pleasure of meeting with Lee Grant Irons and his daughter, Morgan Irons, during Season 5 of the Space 3D podcast. We’ve invited Lee Grant back this season to continue our discussion. This is part 2 of our latest interview.Lee Grant Irons is a scientist and engineer, with experience in the fields and industries of space plasma and computational physics, nuclear power design and operations, radioactive and hazardous waste management, environmental remediation, and large-scale engineering and construction projects.In this episode, cohosts Tom Hill and Eleanor O’Rangers begin to delve into the foundational elements of Pancosmorio Theory with Lee, who just published an article on this subject with his daughter, Morgan Irons: Frontiers | Pancosmorio (world limit) theory of the sustainability of human migration and settlement in space (frontiersin.org)Briefly, Pancosmorio Theory draws on ecological thermodynamics theory and the methodology of abductive reasoning to consider the consequences of humans leaving Earth’s life-sustaining regenerative systems behind. The paper argues that human growth beyond Earth will be limited by the absence of these systems and the implications of leaving them behind.While this episode ends on what might be perceived as a bit of a pessimistic tone regarding the future of space settlement, we promise that there is a more positive message when we air part 3 of our interview, so make sure to tune in to that!