December 28, 2018 updates Posted on December 28, 2018June 28, 2020 by Doug Loss Computer Simulations of Space Societies https://www.springer.com/us/book/9783319905594 What We Know About Extraterrestrial Intelligence https://www.springer.com/us/book/9783319444550 The Ethics of Space Exploration https://www.springer.com/us/book/9783319398259 Dissent, Revolution and Liberty Beyond Earth https://www.springer.com/us/book/9783319293479 Human Governance Beyond Earth https://www.springer.com/us/book/9783319180625 The Meaning of Liberty Beyond Earth https://www.springer.com/us/book/9783319095660 Extraterrestrial Intelligence and Human Imagination https://www.springer.com/us/book/9783319105505 New Comparative Metric for Evaluating Spacecraft Radiation Shielding https://arc.aiaa.org/doi/abs/10.2514/1.A34360